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Toshiaki Iwazumi

Section

International Center for Synchrotron Radiation Innovation Smart

Job title

Specially Appointed Professor(Research)

researchmap

https://researchmap.jp/read0097067

J-GLOBAL ID

200901001708368398

Research Interests 1

Ｘ線分光学

Research Areas 2

Natural sciences / Magnetism, superconductivity, and strongly correlated systems /
Natural sciences / Semiconductors, optical and atomic physics /

Papers 135

Emergent heavy-fermion behavior from f–d and d–d hybridization in the quadruple perovskite CeCu3Ru3.25O12

Hiroaki Anzai, Yasuaki Kikuchi, Yuta Kato, Kyoichi Otsuki, Toshiaki Iwazumi, Yukimi Tanimoto, Hitoshi Sato, Masashi Arita, Ikuya Yamada

Physical Review B　2026/10/13
Publisher: American Physical Society (APS)
DOI： 10.1103/3ktt-1x4q 　

ISSN： 2469-9950 2469-9969

eISSN： 2469-9969
Observation of Raman components in resonant X-ray emission spectra of Fe cyanide

Toshiaki Iwazumi, Masayuki Tanaka, Akihiro Ueno, Yuuji Koga, Yoshinori Kitajima, Yasuhito Isozumi

Materials Today: Proceedings　2026/04/21
Publisher: Elsevier {BV}
DOI： 10.1016/j.matpr.2023.05.373 　

ISSN： 2214-7853
Detailed Fe 3d electronic structures of Prussian blue analogs studied by X-ray absorption spectroscopy

Kensaku Kudo, Ryohei Takeshita, Daisuke Kobayashi, Toshiaki Iwazumi, Hiroko Tokoro, Kosuke Nakagawa, Shinichi Ohkoshi, Yoshinori Kitajima

Materials Today: Proceedings　2026/04/21
Publisher: Elsevier {BV}
DOI： 10.1016/j.matpr.2023.04.280 　

ISSN： 2214-7853
Sn-doping effect on dielectric properties of Ba(Ti1–xSnx)O3 studied by x-ray absorption and emission spectroscopies

Hiroyasu Sakano, Nobuo Nakajima, Shintaro Noda, Eiki Kakihara, Desheng Fu, Yasuhisa Tezuka, Toshiaki Iwazumi

Applied Physics Letters　2025/08/25

DOI： 10.1063/5.0292262 　
Low-Temperature Electronic Structure of SrCu₃Ru₄O₁₂ Revealed by Synchrotron Radiation Spectroscopy

Hiroaki Anzai, Yasuaki Kikuchi, Yuta Kato, Toshiaki Iwazumi, Yukimi Tanimoto, Hitoshi Sato, Masashi Arita, Ikuya Yamada

Journal of the Physical Society of Japan　2025/08/15

DOI： 10.7566/jpsj.94.084802 　

ISSN： 0031-9015 1347-4073
Evaluation of Electronic Structure of Prussian Blue Analogue RbMn[Fe(CN)₆] in Temperature-Induced Phase Transition Phenomena Peer-reviewed

Takuma Tsukamoto, Kazuho Hayashi, Toshiaki Iwazumi, Hiroko Tokoro, Kosuke Nakagawa, Shinichi Ohkoshi

Journal of the Physical Society of Japan　93　(4)　2024/04/15
Publisher: Physical Society of Japan
DOI： 10.7566/jpsj.93.044704 　

ISSN： 0031-9015

eISSN： 1347-4073
Structural studies of Prussian Blue Analogs containing trivalent hexacyanoferrate by extended X-ray absorption fine structure spectroscopy

Toshiaki Iwazumi, Akihito Kusumoto, Ryohei Takeshita, Daisuke Kobayashi, Hiroko Tokoro, Kosuke Nakagawa, Shin-ichi Ohkoshi

Journal of Electron Spectroscopy and Related Phenomena　2024/01

DOI： 10.1016/j.elspec.2024.147421 　

ISSN： 0368-2048
Temperature dependence of electronic structure on the ferroelectric phase transition of BaTiO3

Yasuhisa Tezuka, Shunsuke Nozawa, Nobuo Nakajima, Toshiaki Iwazumi

Physical Review B　104　(23)　2021/12/23
Publisher: American Physical Society ({APS})
DOI： 10.1103/physrevb.104.235148 　

ISSN： 2469-9950 2469-9969
Mixed-valence state of the rare-earth compounds YbXCu4 (X = Mg, Cd, In, and Sn): Magnetic susceptibility, x-ray diffraction, and x-ray absorption spectroscopy investigations

Hiroaki Anzai, Suzuna Ishihara, Hiroto Shiono, Kohei Morikawa, Toshiaki Iwazumi, Hitoshi Sato, Tao Zhuang, Keisuke T. Matsumoto, Koichi Hiraoka

Physical Review B　100　(24)　2019/12/16
Publisher: American Physical Society ({APS})
DOI： 10.1103/physrevb.100.245124 　

ISSN： 2469-9950 2469-9969
Temperature and Azimuth Dependent Electronic Structure of Ti Oxides by means of Resonant X-ray Raman Scattering.

Tezuka Y., Kamide H., Takahashi M., Nozawa S., Nakajima N., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　74.2　1261-1261　2019
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.74.2.0_1261 　

eISSN： 2189-0803
Yb LIII-edge and Cu K-edge x-ray absorption spectroscopy in YbCdCu4 and YbInCu4

Hiroaki Anzai, Suzuna Ishihara, Hiroto Shiono, Kojiro Mimura, Toshiaki Iwazumi, Hitoshi Sato, Tao Zhuang, Keisuke T. Matsumoto, Koichi Hiraoka

AIP Conference Proceedings　2019
Publisher: Author(s)
DOI： 10.1063/1.5084607 　

ISSN： 0094-243X
Structures of PBAs investigated by extended x-ray absorption fine structure spectroscopy Peer-reviewed

Kusumoto,A, Kudo,K, Iwazumi,T, Tokoro,H, Nakagawa,K, Ohkoshi,S, Kitajima,Y

Meeting Abstracts of the Physical Society of Japan　73　1025-1025　2018
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.73.2.0_1025 　

ISSN： 2189-0803
Electronic structure study of CaCu3Ti4O12 by means of X-ray Raman scattering

Y. Tezuka, Y. Yokouchi, S. Sasaki, S. Nakamoto, K. Nishiyama, M. Mikami, H.J. Im, T. Watanabe, S. Nozawa, N. Nakajima, T. Iwazumi

Journal of Electron Spectroscopy and Related Phenomena　220　114-117　2017/10
Publisher: Elsevier {BV}
DOI： 10.1016/j.elspec.2017.04.005 　

ISSN： 0368-2048
Temperature Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

Tezuka Y., Nakamoto S., Nishiyama K., Im H., Watanabe T., Nozawa S., Nakajima N., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　72.2　2311-2311　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_2311 　

eISSN： 2189-0803
Electronic structure of Prussian Blue Analogues investigated by X-ray absorption spectroscopy

Kudo,K, Takeshita,R, Kobayashi,D, Iwazumi,T, Tokoro,H, Nakagawa,K, Okoshi,S, Kitajima,Y

Meeting Abstracts of the Physical Society of Japan　71　2561-2561　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_2561 　

ISSN： 2189-0803

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<p>6配位型鉄シアノ錯体を含むプルシアンブルー類似体の電子状態の解明を目的とし、Photon FactoryにおいてFe L-edge及びK-edge X線吸収分光測定を行った。L-edgeとK-edgeでの吸収スペクトルを比較することにより、新たに2p→σ^*^励起、1s→π^*^励起、1s→σ^*^励起を同定した。また、6配位型鉄シアノ錯体に連なる遷移金属とシアノ錯体の窒素の間の結合距離が、鉄シアノ錯体の電子状態に大きな影響を与えていることが分かった。</p>
21pPSA-13 Electronic Structure Study of CCTO by means of X-ray Raman Scattering III

Tezuka Y., Yokouchi Y., Nakamoto S., Im H., Watanabe T., Nozawa S., Nakajima N., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　71.1　1573　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.1.0_1573 　

eISSN： 2189-0803
16pAD-6 Electronic Structure Study of CCTO by means of X-ray Raman Scattering

Tezuka Y., Yokouchi Y., Nakamoto S., Im H., Watanabe T., Nozawa S., Nakajima N., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　70.2　2430　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_2430 　

eISSN： 2189-0803
21aCN-14 Resonant X-ray Raman Scattering by Core-Excitation

Tezuka Y., Osawa H., Nozawa S., Nakajima N., Sato H., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　70.1　1430　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.1.0_1430 　

eISSN： 2189-0803
Core Excitations in Resonant X-ray Raman Scattering of Titanium Oxides: An Approach to Studying Electronic Structures

Yasuhisa Tezuka, Toshiyuki Sasaki, Yasuo Fujita, Takanori Iwamoto, Hitoshi Osawa, Shunsuke Nozawa, Nobuo Nakajima, Hitoshi Sato, Toshiaki Iwazumi

Journal of the Physical Society of Japan　83　(1)　014707-014707　2014/01/15
Publisher: Physical Society of Japan
DOI： 10.7566/jpsj.83.014707 　

ISSN： 0031-9015 1347-4073
29pPSA-14 Electronic Structure Study of CaCu_3Ti_4O_<12> by means of X-ray Raman Scattering

Tezuka Y., Ssasaki S., Mikami M., Im H., Watanabe T., Nozawa S., Nakajima N., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　69.1.4　763　2014
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.69.1.4.0_763_2 　

eISSN： 2189-0803
10aPS-21 Electronic Structure Study of CCTO by means of X-ray Raman Scattering II

Tezuka Y., Mikami M., Yokouchi Y., Im H., Watanabe T., Nozawa S., Nakajima N., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　69.2.4　540　2014
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.69.2.4.0_540_3 　

eISSN： 2189-0803
Photoinduced Local Symmetry Breaking in SrTiO₃

Shunsuke Nozawa, Toshiaki Iwazumi, Hitoshi Osawa, Takayuki Uozumi

Applied Physics Express　6　(6)　061501-061501　2013/06/01
Publisher: {IOP} Publishing
DOI： 10.7567/apex.6.061501 　

ISSN： 1882-0778 1882-0786
UV-Induced Change in the Electronic Structure of SrTiO₃at Low Temperature Probed by Resonant X-ray Emission Spectroscopy

Shuhei Kawakami, Nobuo Nakajima, Takahiro Takigawa, Masashi Nakatake, Hiroshi Maruyama, Yasuhisa Tezuka, Toshiaki Iwazumi

Journal of the Physical Society of Japan　82　(5)　053701-053701　2013/05/15
Publisher: Physical Society of Japan
DOI： 10.7566/jpsj.82.053701 　

ISSN： 0031-9015 1347-4073
Observation of π backbonding features appearing in Fe 2p X-ray absorption spectra and Fe 1s-4p-1s resonant X-ray emission spectra of RbMn[Fe(CN)₆]

Yoshinori Kitajima, Yūsuke Nanba, Masayuki Tanaka, Yuji Koga, Akihiro Ueno, Kosuke Nakagawa, Hiroko Tokoro, Shin-ichi Ohkoshi, Toshiaki Iwazumi, Kozo Okada, Yasuhito Isozumi

Journal of Physics: Conference Series　430　012082-012082　2013/04/22
Publisher: {IOP} Publishing
DOI： 10.1088/1742-6596/430/1/012082 　

ISSN： 1742-6588 1742-6596
28pPSB-15 Electronic Structure Study of Anatase (TiO_2) by means of X-ray Raman Scattering Spectroscopy. II

Tezuka Y., Jin S., Oura R., Sasaki Y., Nozawa S., Iwazumi T., Isozumi Y., Ishiwata Y., Ozawa K., Emori M., Sakama H.

Meeting Abstracts of the Physical Society of Japan　68.1.4　836　2013
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.68.1.4.0_836_1 　

eISSN： 2189-0803
27pXZB-7 UV-induced change in the electronic structure of SrTiO_3 at low temperature

Kawakami S., Nakajima N., Takigawa T., Nakatake M., Maruyama H., Tezuka Y., Iwazumi T., Mizumaki M., Kawamura N.

Meeting Abstracts of the Physical Society of Japan　68.1.4　1038　2013
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.68.1.4.0_1038_3 　

eISSN： 2189-0803
26aPS-131 Resonant X-ray emission spectroscopic study on A-site dependence of Ti-O bonding in perovskite titanates

Nakajima N., Watanabe G., Kawakami S., Isohama Y., Maruyama H., Tezuka Y., Iwazumi T., Kawamura N., Mizumaki M.

Meeting Abstracts of the Physical Society of Japan　68.1.4　1017　2013
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.68.1.4.0_1017_1 　

eISSN： 2189-0803
Temperature Dependence of Anisotropic Electronic Structure of BaTiO_3 by means of X-ray Raman Scattering

Tezuka Y., Oura R., Sasaki S., Mikami M., Nakajima N., Nozawa S., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　68.2.4　862　2013
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.68.2.4.0_862_4 　

eISSN： 2189-0803
Enhancement of dielectric constant of BaTiO3 nanoparticles studied by resonant x-ray emission spectroscopy

Nobuo Nakajima, Megumi Oki, Yoichi Isohama, Hiroshi Maruyama, Yasuhisa Tezuka, Kotaro Ishiji, Toshiaki Iwazumi, Kozo Okada

Physical Review B　86　(22)　2012/12/28
Publisher: American Physical Society ({APS})
DOI： 10.1103/physrevb.86.224114 　

ISSN： 1098-0121 1550-235X
24pPSA-16 Angle-dspendenct X-ray R.aman Scattering of Ti-oxides

Tezuka Y., Shinoya T., Soyama H., Nakagawa S., Ohsawa H., Nozawa S., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　67.1.4　776　2012
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.67.1.4.0_776_4 　

eISSN： 2189-0803
Tetragonal–cubic phase transition in BaTiO3 probed by resonant X-ray emission spectroscopy

Yoichi Isohama, Nobuo Nakajima, Hiroshi Maruyama, Yasuhisa Tezuka, Toshiaki Iwazumi

Journal of Electron Spectroscopy and Related Phenomena　184　(3-6)　207-209　2011/04
Publisher: Elsevier {BV}
DOI： 10.1016/j.elspec.2010.12.023 　

ISSN： 0368-2048
Polarization-dependent Ti K X-ray absorption and emission studies of Ti2O3 single crystal

H. Sato, H. Maso, Y. Utsumi, H. Kurihara, Y. Mukaegawa, Y. Tezuka, T. Iwazumi, F. Iga, M. Tsubota, H. Namatame, M. Taniguchi

Journal of Electron Spectroscopy and Related Phenomena　184　(3-6)　184-187　2011/04
Publisher: Elsevier {BV}
DOI： 10.1016/j.elspec.2011.02.003 　

ISSN： 0368-2048
Effects of hole doping in electronic states of La1−xSrxMnO3 probed by magnetic Compton scattering Peer-reviewed

T. Mizoroki, M. Itou, Y. Taguchi, T. Iwazumi, Y. Sakurai

Appl. Phys. Lett.　98　(5)　052107-1-052107-3　2011/02
Publisher: {AIP} Publishing
DOI： 10.1063/1.3552683 　

ISSN： 0003-6951 1077-3118

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<jats:p>We have carried out magnetic Compton scattering measurements on polycrystalline samples of the perovskite manganites La1−xSrxMnO3 covering the hole-doping range from x=0.1 to x=0.5. Charge and magnetic Compton profiles were measured in order to obtain Compton profiles of spin-wise subbands. By considering the doping-dependency of the subband Compton profiles, we show how the electronic states evolve associated with hole doping. The results indicate that doped holes predominantly enter into the O 2p states in the lightly doped region and the charge transfer occurs from the up-spin Mn 3d to the down-spin Mn 3d states in the heavily doped region.</jats:p>
22pGN-6 Temperature Dependence of Electronic Structure of BaTiO_3 by means of Resonant X-ray Raman Scattering

Tezuka Y., Shinoya T., Soyama H., Nakagawa S., Ohsawa H., Nozawa S., Nakajima N., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　66.2.4　990　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.2.4.0_990_2 　

eISSN： 2189-0803
25pTM-12 Temperature Dependence of Electronic Structure of BaTiO_3 by means of Resonant X-ray Raman Scattering.

Tezuka Y., Shinoya T., Soyama H., Nakagawa S., Ohsawa H., Nozawa S., Nakajima N., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　66.1.4　962　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.1.4.0_962_3 　

eISSN： 2189-0803
25pPSA-5 Observation of the electronic states by x-ray emission spectroscopy under applied electric field

Nakajima N., Isohama Y., Watanabe G., Mizumaki M., Kawamura N., Tezuka Y., Iwazumi T., Maruyama H.

Meeting Abstracts of the Physical Society of Japan　66.1.4　747　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.1.4.0_747_1 　

eISSN： 2189-0803
25pPSA-41 An experimental study of the covalency in titanium oxides probed by Ti Κβ resonant x-ray emission spectroscopy

Watanabe G., Isohama Y., Nakajima N., Maruyama H., Tezuka Y., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　66.1.4　755　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.1.4.0_755_2 　

eISSN： 2189-0803
Observation of the Fixed Fe–CN–Mn Cluster in Cesium Manganese Hexacyanoferrate

Kotaro Ishiji, Masataka Deguchi, Kazutoshi Kawakami, Nobuo Nakajima, Tomoyuki Matsuda, Hiroko Tokoro, Shin-ichi Ohkoshi, Toshiaki Iwazumi

Journal of the Physical Society of Japan　79　(7)　074801-074801　2010/07/15
Publisher: Physical Society of Japan
DOI： 10.1143/jpsj.79.074801 　

ISSN： 0031-9015 1347-4073
Observation of X-ray-induced phase transition phenomenon of cesium manganese hexacyanoferrate

K Ishiji, M Deguchi, N Nakajima, T Matsuda, H Tokoro, S Ohkoshi, T Iwazumi

Journal of Physics: Conference Series　148　012046-012046　2009/02/01
Publisher: {IOP} Publishing
DOI： 10.1088/1742-6596/148/1/012046 　

ISSN： 1742-6596
First observation of soft x-ray induced phase transition of RbMn[Fe(CN)6] studied by Fe L-edge x-ray absorption spectroscopy

Yoshinori Kitajima, Kotaro Ishiji, Tomoyuki Matsuda, Hiroko Tokoro, Shin-ichi Ohkoshi, Toshiaki Iwazumi

Journal of Physics: Conference Series　148　012032-012032　2009/02/01
Publisher: {IOP} Publishing
DOI： 10.1088/1742-6596/148/1/012032 　

ISSN： 1742-6596
A UV-induced one-dimensional motion of titanium ions in perovskite titanates Peer-reviewed

Nobuo Nakajima, Masataka Deguchi, Naoki Ishimatsu, Hiroshi Maruyama, Kotaro Ishiji, Toshiaki Iwazumi

14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS　190　2009

DOI： 10.1088/1742-6596/190/1/012083 　

ISSN： 1742-6588
Luminescence mechanism of (Pr, Al)-doped SrTiO3 fine particles investigated by x-ray absorption spectroscopy

Masataka Deguchi, Nobuo Nakajima, Kazutoshi Kawakami, Naoki Ishimatsu, Hiroshi Maruyama, Chikako Moriyoshi, Yoshihiro Kuroiwa, Shunsuke Nozawa, Kotaro Ishiji, Toshiaki Iwazumi

Physical Review B　2008/08/08

DOI： 10.1103/physrevb.78.073103 　

ISSN： 1098-0121 1550-235X
26aPS-9 Polarization-dependent Ti K emission spectroscopy of Ti_2O_3 single crystal

Maso H., Kurihara H., Sato H., Mukaegawa Y., Utsumi Y., Tezuka Y., Iwazumi T., Iga F., Tsubota M., Takabatake T., Namatame H., Taniguchi M.

Meeting Abstracts of the Physical Society of Japan　63.1.4　733　2008
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.63.1.4.0_733_4 　

eISSN： 2189-0803
22aVE-8 Resonant X-ray Raman Scattering of BaTiO_3 III

Tezuka Y., Osawa H., Nozawa S., Nakajima N., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　63.2.4　884　2008
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.63.2.4.0_884_3 　

eISSN： 2189-0803
Observation of phase transition of cesium manganese hexacyanoferrates by X-ray absorption spectroscopy

Kotaro Ishiji, Tomoyuki Matsuda, Hiroko Tokoro, Toshiaki Iwazumi, Kazuhito Hashimoto, Shin-ichi Ohkoshi

Journal of Physics and Chemistry of Solids　2007/11

DOI： 10.1016/j.jpcs.2007.08.043 　

ISSN： 0022-3697
21pTK-7 Temperature dependence of perovskite titanate particles studied by X-ray emission spectroscopy

Nakajima N., Deguchi M., Kawakami K., Shindo Y., Kai H., Ishimatsu, Maruyama H., Iwamoto T., Tezuka Y., Iwazumi T.

Meeting Abstracts of the Physical Society of Japan　62.2.4　729　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.2.4.0_729_3 　

eISSN： 2189-0803
20aXA-11 Resonant X-ray Roman Scattering of BaTiO_3

Tezuka Y., Fujita T., Sasaki T., Iwamoto T., Oki M., Nakajima N., Osawa H., Ishiji K., Iwazumi T., Isoziumi Y.

Meeting Abstracts of the Physical Society of Japan　62.1.4　965　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.1.4.0_965_3 　

eISSN： 2189-0803
19pPSA-18 Resonant Incicstic X-ray Scattering of Ti Oxides. IV

Tezuka Y., Sasaki T., Fujita Y., Iwamoto T., Osawa H., Ishiji K., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　62.1.4　720　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.1.4.0_720_4 　

eISSN： 2189-0803
23pPSA-72 Resonant Inelestic X-ray Scattering of Ti Oxides. V

Tezuka Y., Iwamoto T., Osawa H., Nozawa S., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　62.2.4　764　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.2.4.0_764_4 　

eISSN： 2189-0803
22aTE-11 Resonant X-ray Raman Scattering of BaTiO_3 II

Tezuka Y., Iwamoto T., Nakajima N., Osawa H., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　62.2.4　988　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.2.4.0_988_1 　

eISSN： 2189-0803
24pQE-12 Valence-band structure of pseudobinary alloys Fe_xCo_<1-x>Si: II

Emi K., Tobita N., Matsumoto T., Nakajima N., Ishimatsu N., Maruyama H., Nakatake M., Takeda Y., Iwazumi T., Tezuka Y., Yamada H.

Meeting Abstracts of the Physical Society of Japan　61.2.4　589　2006
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.61.2.4.0_589_1 　

eISSN： 2189-0803
24aRA-5 Size dependence on the electronic structure of BaTiO_3 nanoparticles studied by X-ray Emission spectroscopy

OKI M., NAKAJIMA N., ISHIMATSU N., MARUYAMA H., TEZUKA Y., SASAKI T., FUJITA Y., IWAMOTO T., ISHIJI K., IWAZUMI T., IWAKI M., TODA T.

Meeting Abstracts of the Physical Society of Japan　61.2.4　580　2006
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.61.2.4.0_580_4 　

eISSN： 2189-0803
25aPS-16 Resonance x-ray Raman scattering of BaTiO_3

Tezuka Y., Fujita Y., Sasaki T., Iwamoto T., Oki M., Nakajima N., Ishiji K., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　61.2.4　600　2006
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.61.2.4.0_600_2 　

eISSN： 2189-0803
25aPS-15 Resonant Inelastic X-Ray Scattering of Ti Oxides III

Tezuka Y., Sasaki T., Fujita Y., Iwamoto T., Osawa H., Ishiji K., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　61.2.4　600　2006
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.61.2.4.0_600_1 　

eISSN： 2189-0803
28aPS-13 Resonant Inelestic X-ray Scattering of Ti Oxides II

Tezuka Y., Sasaki T., Fujita Y., Osawa H., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　61.1.4　727　2006
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.61.1.4.0_727_1 　

eISSN： 2189-0803
Direct observation of the quantum fluctuation controlled by ultraviolet irradiation in SrTiO3

Shunsuke Nozawa, Toshiaki Iwazumi, Hitoshi Osawa

Physical Review B　2005/09/06

DOI： 10.1103/physrevb.72.121101 　

ISSN： 1098-0121 1550-235X
20pPSA-13 Resonant Inelestic X-ray Scattering of Ti Oxides

Tezuka Y., Sasaki T., Osawa H., Iwazumi T., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　60.2.4　584　2005
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.60.2.4.0_584_2 　

eISSN： 2189-0803
Resonant Inelastic X-Ray Scattering at the K Edge of Ge

Yunori Nisikawa, Manabu Usuda, Jun-ichi Igarashi, Hironobu Shoji, Toshiaki Iwazumi

Journal of the Physical Society of Japan　2004/04/15

DOI： 10.1143/jpsj.73.970 　

ISSN： 0031-9015 1347-4073
Resonant X-Ray Emission Spectra by the Electric Quadrupole Excitation at the MnK-Edge of MnO

Hironobu Shoji, Munetaka Taguchi, Eiju Hirai, Toshiaki Iwazumi, Akio Kotani, Susumu Nanao, Yasuhito Isozumi

Journal of the Physical Society of Japan　2003/06/15

DOI： 10.1143/jpsj.72.1560 　

ISSN： 0031-9015 1347-4073
Magnetic Circular Dichroism of Resonant X-ray Emission Spectroscopy for Sm L3M4,5 and L2M4 in Sm21Co79 Amorphous Alloy

Tetsuya Nakamura, Hironobu Shoji, Eiju Hirai, Susumu Nanao, Keiji Fukui, Haruhiko Ogasawara, Akio Kotani, Toshiaki Iwazumi, Isao Harada, Rintaro Katano, Yasuhito Isozumi

Physical Review B　2003/03/31

DOI： 10.1103/physrevb.67.094439 　

ISSN： 0163-1829 1095-3795
Thermal phase transition of RbMnFe(CN)6 observed by X-ray emission and absorption spectroscopy

Hitoshi Osawa, Toshiaki Iwazumi, Hiroko Tokoro, Shin-ichi Ohkoshi, Kazuhito Hashimoto, Hironobu Shoji, Eiju Hirai, Tetsuya Nakamura, Susumu Nanao, Yasuhito Isozumi

Solid State Communications　125　(5)　237-241　2003/02
Publisher: Elsevier {BV}
DOI： 10.1016/s0038-1098(02)00805-0 　

ISSN： 0038-1098
Magnetic circular dichroism of resonant inelastic X-ray scattering in magnetic materials Peer-reviewed

T Iwazumi

X-RAY AND INNER-SHELL PROCESSES　652　329-337　2003

DOI： 10.1063/1.1536393 　

ISSN： 0094-243X
RESONANT Lα X-RAY RAMAN SCATTERING SPECTRA OF CeF3, CeO2 and CeB6

S. NAKAI, T. WATANABE, K. SASAKI, T. IWASAKI, M. ODAKA, T. KASHIWAKURA, T. YAMAZAKI, T. IWAZUMI

Surface Review and Letters　2002/04

DOI： 10.1142/s0218625x02003342 　

ISSN： 0218-625X 1793-6667

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<jats:p> Resonant L<jats:sub>α</jats:sub> emission spectra of Ce compounds, CeF <jats:sub>3</jats:sub>, CeO <jats:sub>2</jats:sub> and CeB <jats:sub>6</jats:sub>, were measured around the L<jats:sub>III</jats:sub> absorption threshold. As the energy of the incident photon is tuned at the pre-edge region and at the absorption peaks of the Ce L<jats:sub>III</jats:sub> absorption spectrum, the Raman peaks are resonantly enhanced. Obtained spectra are decomposed into Raman and normal L<jats:sub>α</jats:sub> emission peaks by line shape analysis. The results show that the Raman spectra provide more detailed information than the absorption spectra about the 4f configuration of Ce compounds. </jats:p>
Spin-State Transitions in an Iron Spin-Crossover Complex Observed with X-ray Emission and X-ray Absorption

H. Osawa, T. Iwazumi, H. Shoji, E. Hirai, T. Nakamura, Y. Ogawa, T. Ishikawa, S. Koshihara, Y. Isozumi, S. Nanao

Phase Transitions　2002/01

DOI： 10.1080/01411590290034065 　

ISSN： 0141-1594 1029-0338
Magnetic Circular Dichroism of Resonant X-Ray Emission Spectroscopy in Longitudinal and Transverse Geometries

Keiji Fukui, Haruhiko Ogasawara, Akio Kotani, Toshiaki Iwazumi, Hironobu Shoji, Tetsuya Nakamura

Journal of the Physical Society of Japan　2001/11

DOI： 10.1143/jpsj.70.3457 　

ISSN： 0031-9015 1347-4073
Magnetic circular dichroism of resonant X-ray emission spectroscopy in the transverse geometry Peer-reviewed

K Fukui, H Ogasawara, A Kotani, T Iwazumi, H Shoji, T Nakamura

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　70　(5)　1230-1232　2001/05

DOI： 10.1143/jpsj.70.1230 　

ISSN： 0031-9015
Resonant X-ray emission spectra of K₂Ni(CN)₄.H₂O at the Ni K-edge

Y. Takata, T. Iwazumi, N. Kosugi

Journal of Synchrotron Radiation　2001/03/01

DOI： 10.1107/s0909049500015570 　

ISSN： 0909-0495

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<jats:p>Resonant X-ray emission spectra were measured at the Ni K-edge for a planar low-spin nickel complex K<jats:sub>2</jats:sub>Ni(CN)<jats:sub>4</jats:sub>.H<jats:sub>2</jats:sub>O. In the Ni K<jats:sub>β</jats:sub> emission spectra, a resonant X-ray Raman scattering was observed in the pre-edge region, showing linear energy dispersion of the emitted photon with the incident photon energy. No energy loss features corresponding to the ligand-to-metal charge-transfer (LMCT) was identified. The LMCT feature is characteristic of strongly correlated systems such as NiO; therefore, the LMCT effect proves to be significantly suppressed. This is consistent considering strong covalent character between low-lying π* ligand and metal 3d (occupied) orbitals in low-spin nickel complexes.</jats:p>
Magnetic circular dichroism of 3d _5/2 → 2p _3/2 resonant inelastic X-ray scattering at the Ho L _III-edge in Ho₃Fe₅O₁₂

Tetsuya Nakamura, Naomi Kawamura, Toshiaki Iwazumi, Hiroshi Maruyama, Akiri Urata, Hironobu Shoji, Susumu Nanao, Shunji Kishimoto, Rintaro Katano, Yasuhito Isozumi

Journal of Synchrotron Radiation　2001/03/01

DOI： 10.1107/s0909049500018392 　

ISSN： 0909-0495

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<jats:p>Magnetic circular dichroism (MCD) of resonant inelastic X-ray scattering (RIXS) of 3<jats:italic>d</jats:italic> <jats:sub>5/2</jats:sub> → 2<jats:italic>p</jats:italic> <jats:sub>3/2</jats:sub> decay (Ho <jats:italic>L</jats:italic>α<jats:sub>1</jats:sub>) was measured at the Ho L<jats:sub>III</jats:sub>-edge in Ho<jats:sub>3</jats:sub>Fe<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub>. The MCD-RIXS, in which the intermediate state has the <jats:underline>2<jats:italic>p</jats:italic> </jats:underline> 4<jats:italic>f</jats:italic> <jats:sup> <jats:italic>n</jats:italic> + 1</jats:sup> configuration due to the quadrupolar transition of 2<jats:italic>p</jats:italic> → 4<jats:italic>f</jats:italic>, was also observed at the pre-edge region of the Ho <jats:italic>L</jats:italic> <jats:sub>III</jats:sub>-edge. The obvious superposition of two peaks, which comes from the high-energy off-resonant Raman scattering and the fluorescence, could be found in both the RIXS and the MCD-RIXS when the energy of the incoming X-ray was 7eV higher than the white line. The dependence of the integration of the MCD-RIXS spectra on the incident x-ray energy could roughly reproduce the MCD of X-ray absorption spectra (XAS).</jats:p>
Magnetic circular dichroism of the x-ray-emission spectra for the 2p→1s decay in Co metal

Tetsuya Nakamura, Hironobu Shoji, Susumu Nanao, Toshiaki Iwazumi, Shunji Kishimoto, Rintaro Katano, Yasuhito Isozumi

Physical Review B　2000/09/01

DOI： 10.1103/physrevb.62.5301 　

ISSN： 0163-1829 1095-3795
Magnetic circular dichroism of Gd 3d–2p and 4d–2p X-ray emission in ferrimagnetic Gd–Co amorphous

T Iwazumi, T Nakamura, H Shoji, K Kobayashi, S Kishimoto, R Katano, Y Isozumi, S Nanao

Journal of Physics and Chemistry of Solids　2000/03

DOI： 10.1016/s0022-3697(99)00335-2 　

ISSN： 0022-3697
Scattering-angle dependence of the magnetic circular dichroism of resonant inelastic X-ray scattering

T. Iwazumi, K. Kobayashi, T. Tominaga, T. Nakamura, S. Nanao, S. Kishimoto, D. Ohsawa, R. Katano, Y. Isozumi

Journal of Synchrotron Radiation　1999/05/01

DOI： 10.1107/s0909049599000023 　

ISSN： 0909-0495
Resonant Inelastic X-Ray Scattering in Ni Componds

Hironobu Shoji, Kenji Kobayashi, Toshiaki Iwazumi, Rintaro Katano, Yasuhito Isozumi, Shunji Kisnimoto, Susumu Nanao

Japanese Journal of Applied Physics　1999/01/01

DOI： 10.7567/jjaps.38s1.592 　

ISSN： 0021-4922 1347-4065

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<jats:p> Resonant inelastic x-ray scattering was measured at the Ni <jats:italic>K</jats:italic>-edge in NiO, NiSO<jats:sub>4</jats:sub>, NiF<jats:sub>2</jats:sub>, NiCl<jats:sub>2</jats:sub> and NiBr<jats:sub>2</jats:sub>. The charge-transfer energies from a ligand field to the Ni 3<jats:italic>d</jats:italic> states of these compounds are obtained directly from the energy differences between the elastic and the 4<jats:italic>p</jats:italic>→1<jats:italic>s</jats:italic> inelastic scattering. The sample dependence of the energy shift agrees roughly with the result of a fitting calculation of the 2<jats:italic>p</jats:italic>-x-ray photoelectron spectroscopy. We observed a negative correlation between the energy shift and the intensity ratio of the shoulder to the main peak of the Ni <jats:italic>K</jats:italic>β<jats:sub>1,3</jats:sub> emission spectra. Because this spectral ratio refers to the number of 3d electrons, the charge-transfer to the 3<jats:italic>d</jats:italic> states is depressed with increasing charge-transfer energy. </jats:p>
Resonant X-ray magnetic scattering from the twisted states of an Fe/Gd multilayer

H Hashizume, N Ishimatsu, O Sakata, T Iizuka, N Hosoito, K Namikawa, T Iwazumi, G Srajer, C.T Venkataraman, J.C Lang, C.S Nelson, L.E Berman

Physica B: Condensed Matter　1998/06

DOI： 10.1016/s0921-4526(98)00219-1 　

ISSN： 0921-4526
X-ray magnetic circular dichroism of multielectron excitation by fluorescence spectroscopy

T Nakamura, S Nanao, T Iwazumi, K Kobayashi, S Kishimoto, D Ohsawa, R Katano, Y Isozumi

Journal of Electron Spectroscopy and Related Phenomena　1998/05

DOI： 10.1016/s0368-2048(98)00133-9 　

ISSN： 0368-2048
Magnetic circular dichroism of lanthanoid Lβ2,15 fluorescence spectra of magnetic lanthanoid compounds

T Iwazumi, K Kobayashi, S Kishimoto, T Nakamura, S Nanao, D Ohsawa, R Katano, Y Isozumi, H Maruyama

Journal of Electron Spectroscopy and Related Phenomena　1998/05

DOI： 10.1016/s0368-2048(98)00132-7 　

ISSN： 0368-2048
Magnetic resonance effect in x-ray resonant Raman scattering

T. Iwazumi, K. Kobayashi, S. Kishimoto, T. Nakamura, S. Nanao, D. Ohsawa, R. Katano, Y. Isozumi

Physical Review B　1997/12/01

DOI： 10.1103/physrevb.56.r14267 　

ISSN： 0163-1829 1095-3795
X-Ray Circular Dichroic Bragg Reflections from a GdCo/Ag Multilayer

Hiroo Hashizume, Naoki Ishimatsu, Osami Sakata, Nobuyoshi Hosoito, Takeshi Emoto, Ki-Bong Lee, Dong-Ryeol Lee, Toshiaki Iwazumi

Japanese Journal of Applied Physics　1997/07/01

DOI： 10.1143/jjap.36.4525 　

ISSN： 0021-4922 1347-4065

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<jats:p> Bragg peaks are observed in difference resonant specular reflectivity signals from a GdCo/Ag multilayer in a flipping magnetic field for circularly polarized X-rays. The element-specific X-ray scattering at the <jats:italic>L</jats:italic> <jats:sub>3</jats:sub> absorption edge of Gd directly evidences layers of magnetically ordered Gd ions stacked at a regular spacing of the multilayer 51 Å period. The Bragg peaks show a negative polarity, which is accounted for by the property of the resonant magnetic-charge interference scattering. </jats:p>
Spin polarization of La 5d-state in La1−xSrxMnO3

K. Kobayashi, T. Iwazumi, S. Suga, S. Imada, T. Muro, Y. Tokura, Y. Moritomo

Physica B: Condensed Matter　1997/07

DOI： 10.1016/s0921-4526(97)00041-0 　

ISSN： 0921-4526
X-ray Reflectivity at the L Edges of Gd

N. Ishimatsu, C. T. Venkataraman, H. Hashizume, N. Hosoito, K. Namikawa, T. Iwazumi

Journal of Synchrotron Radiation　1997/05/01

DOI： 10.1107/s0909049597001441 　

ISSN： 0909-0495
Magnetic circular x-ray dichroism measurements in 3 keV region: At Pd L2,3-edges in 3d transition metals (TM)-Pd alloys (TM = Fe, Co, Ni)

Kenji Kobayashi, Hiroshi Maruyama, Toshiaki Iwazumi, Naomi Kawamura, Izuru Inoue, Hitoshi Yamazaki

Journal of Electron Spectroscopy and Related Phenomena　1996/05

DOI： 10.1016/s0368-2048(96)80085-5 　

ISSN： 0368-2048
Magnetic circular x-ray dichroism at Pd L2,3-edges in FePd alloys

K. Kobayashi, H. Maruyama, T. Iwazumi, N. Kawamura, H. Yamazaki

Solid State Communications　1996/02

DOI： 10.1016/0038-1098(95)00708-3 　

ISSN： 0038-1098
Magnetic EXAFS study of pure Fe and Fe-oxides at Fe K-edge

K. Kobayashi, H. Maruyama, H. Maeda, T. Iwazumi, H. Kawata, H. Yamazaki

Physica B: Condensed Matter　1995/03

DOI： 10.1016/0921-4526(94)00807-8 　

ISSN： 0921-4526
New beamline (BL-28B) for circularly polarized x rays at the Photon Factory

Toshiaki Iwazumi, Atsushi Koyama, Yoshiharu Sakurai

Review of Scientific Instruments　1995/02/01

DOI： 10.1063/1.1145885 　

ISSN： 0034-6748 1089-7623

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<jats:p>Design and experience of the initial operation of a new beamline (BL-28B) for an elliptical-multipole wiggler constructed at the Photon Factory are described. An indirect-water-cooled premirror has been installed for horizontal focusing and vertical collimating. The fixed-exit double-crystal monochromator also has an indirect-water-cooled system. The post-mirror has been commissioned in order to refocus the x-ray beam vertically and cut the higher harmonics of the monochromatized x rays. All the elements of this beam line are high-vacuum compatible.</jats:p>
X-ray circular magnetic dichroism as a probe of spin reorientation transitions in Nd2Fe14B and Er2Fe14B systems

J. Chaboy, A. Marcelli, L.M. García, J. Bartolomé, M.D. Kuz'min, H. Maruyama, K. Kobayashi, H. Kawata, T. Iwazumi

Journal of Magnetism and Magnetic Materials　1995/02

DOI： 10.1016/0304-8853(94)01258-x 　

ISSN： 0304-8853
The high-resolution magnetic Compton profile of Fe-5.8 at.% Si

Y Sakurai, Y Tanaka, T Ohata, Y Watanabe, S Nanao, Y Ushigami, T Iwazumi, H Kawata, N Shiotani

Journal of Physics: Condensed Matter　1994/10/31

DOI： 10.1088/0953-8984/6/44/025 　

ISSN： 0953-8984 1361-648X
X-Ray Circular Magnetic Dichroism (XCMD) as a Probe of the Dynamics of the Spin Reorientation Transitions in Nd ₂ Fe ₁₄ B and Er ₂ Fe ₁₄ B Systems

J Chaboy, A Marcelli, L. M García, J Bartolomé, M Kuz'min, H Maruyama, K Kobayashi, H Kawata, T Iwazumi

Europhysics Letters (EPL)　1994/10/10

DOI： 10.1209/0295-5075/28/2/010 　

ISSN： 0295-5075 1286-4854
Momentum Distribution of Valence Electrons in a Single Al-Li-Cu Icosahedral Quasicrystal

Yoshikazu Tanaka, Yoshiharu Sakurai, Susumu Nanao, Nobuhiro Shiotani, Masahisa Ito, Nobuhiko Sakai, Hiroshi Kawata, Toshiaki Iwazumi

Journal of the Physical Society of Japan　1994/09/15

DOI： 10.1143/jpsj.63.3349 　

ISSN： 0031-9015 1347-4073
First measurement of site-specific normal and magnetic XANES by using a standing wave field International-journal

Toshiaki Iwazumi

Resonant Anomalous X-ray Scattering, Theory and Applications　1994
An Investigation of the Cross-Section for Magnetic Compton Scattering

David N. Timms, Eugeniusz Zukowski, Malcolm J. Cooper, David Laundy, Stephen P. Collins, Fumitake Itoh, Hiroshi SakuraI, Toshiaki Iwazumi, Hiroshi Kawata, Masahisa Ito, Nobuhiko Sakai, Yoshikazu Tanaka

Journal of the Physical Society of Japan　1993/05/15

DOI： 10.1143/jpsj.62.1716 　

ISSN： 0031-9015 1347-4073
Compton Scattering Study of Electron Momentum Density in Vanadium

Nobuhiro Shiotani, Yoshikazu Tanaka, Yoshiharu Sakurai, Nobuhiko Sakai, Masahisa Ito, Fumitake Itoh, Toshiaki Iwazumi, Hiroshi Kawata

Journal of the Physical Society of Japan　1993/01/15

DOI： 10.1143/jpsj.62.239 　

ISSN： 0031-9015 1347-4073
X-ray Magnetic Circular Dichroism at Ho L_2,3-edges in Ho-Iron-Garnet

Kimito Shimomi, Hiroshi Maruyama, Kenji Kobayashi, Akihisa Koizumi, Hitoshi Yamazaki, Toshiaki Iwazumi

Japanese Journal of Applied Physics　1993/01/01

DOI： 10.7567/jjaps.32s2.314 　

ISSN： 0021-4922 1347-4065

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<jats:p> Angle-dependent X-ray magnetic circular dichroism has been measured to make clear quadrupolar contribution to the dichroic spectrum at the Ho <jats:italic>L</jats:italic> <jats:sub>2,3</jats:sub>-edges in holmium-iron-garnet. A distinction between dipolar and quadrupolar contributions is made on the basis of the recently developed theory. The experimental result is not consistent with the theoretical predictions. </jats:p>
Magnetic X-ray absorption measurements at the Pt L2,3- and Fe K-edge in ordered and disordered FePt alloys

H. Maruyama, A. Koizumi, H. Yamazaki, T. Iwazumi, H. Kawata

Journal of Magnetism and Magnetic Materials　1992/02

DOI： 10.1016/0304-8853(92)91666-h 　

ISSN： 0304-8853
Improvement of a sagittally focusing double-crystal monochromator

A. Koyama, M. Nomura, H. Kawata, T. Iwazumi, M. Sato, T. Matsushita

Review of Scientific Instruments　1992/01/01

DOI： 10.1063/1.1143779 　

ISSN： 0034-6748 1089-7623

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<jats:p>Establishment of the parallelism between two axes, that of x rays and that of the cylinder made by a bent crystal, is found to be important when a sagittally focusing double-crystal monochromator is used. Detectable increase of reflection width and decrease of output intensity is observed when the angle between the above two axes becomes only 0.1°. With the help of rotation stages to adjust the axis of the cylinder, the focus smaller than 1 mm is obtained up to 11 keV at BL-6B of the Photon Factory and about 3 mm is established up to 28 keV at NE1 of the Accumulation Ring.</jats:p>
Electron Momentum Distributions in Sodium and Lithium

Yoji Sakurai, Susumu Nanao, Yasuyuki Nagashima, Toshio Hyodo, T. Iwazumi, H. Kawata, M. Ito, N. Shiotani, Alec T. Stewart

Materials Science Forum　1992/01

DOI： 10.4028/www.scientific.net/msf.105-110.803 　

ISSN： 1662-9752
Electron Momentum Distribution in Vanadium

N. Shiotani, Y. Tanaka, M. Ito, Naoya Sakai, Yoji Sakurai, Hiroshi Sakurai, F. Itoh, T. Iwazumi, H. Kawata, Motohide Ando

Materials Science Forum　1992/01

DOI： 10.4028/www.scientific.net/msf.105-110.833 　

ISSN： 1662-9752
Magnetic Compton-profile experiments using circularly polarized hard x rays

Y. Tanaka, N. Sakai, H. Kawata, T. Iwazumi

Review of Scientific Instruments　1992/01/01

DOI： 10.1063/1.1143086 　

ISSN： 0034-6748 1089-7623

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<jats:p>The beamline NE-1A, constructed at the accumulation ring of the National Laboratory for High Energy Physics in Tsukuba has brought a remarkable progress in the magnetic Compton-profile experiment. Circularly polarized hard x rays emitted from an elliptical multipole wiggler are monochromatized and focused with a quasidoubly-bent Si monochromator. We report the methodological aspect of recent successful magnetic Compton-profile experiments with high statistical accuracy achieved by using a Ge solid-state detector having thirteen segments.</jats:p>
Double-crystal monochromator for high-power and high-energy synchrotron radiation

T. Iwazumi, M. Sato, H. Kawata

Review of Scientific Instruments　1992/01/01

DOI： 10.1063/1.1142719 　

ISSN： 0034-6748 1089-7623

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<jats:p>The performance of the fixed-exit-beam sagittal-focusing double-crystal monochromator installed in the elliptical-multipole wiggler beam line at the 6.5-GeV accumulation ring for the TRISTAN project is reported. The first crystal of the monochromator is directly water cooled. Because of its large size, the crystal deformation made by the cooling water pressure and the mounting method of the crystal is found to be a serious problem. The second bent crystal for sagittal focusing and the adjusting mechanisms must be also cooled to avoid the heating by Compton scattered x rays from the first crystal. It is important for the double-crystal monochromator installed in the high-power and high-energy beam line to cool various components in addition to the first crystal.</jats:p>
An x-ray spectrometer for Compton scattering

Y. Sakurai, M. Ito, T. Urai, Y. Tanaka, N. Sakai, T. Iwazumi, H. Kawata, M. Ando, N. Shiotani

Review of Scientific Instruments　1992/01/01

DOI： 10.1063/1.1143079 　

ISSN： 0034-6748 1089-7623

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<jats:p>An x-ray spectrometer has been designed and constructed for Compton scattering measurements using 40–70 keV x-rays from an ellipsoid multipole wiggler (EMPW) installed in the accumulation ring of the National Laboratory for High Energy Physics at Tsukuba. The spectrometer has four sets of a Cauchois-type energy analyzer and an imaging plate, which are arranged on the surface of a cone and share a scattering angle of 160°. In each energy-analyzing system, to increase signal to noise ratio a set of vertical and horizontal slits are inserted between the analyzer and the imaging plate. A resolution of 0.13 a.u. in terms of electron momentum was achieved. A Compton profile of a vanadium single crystal was measured with an integrated counting rate of 400 counts/s.</jats:p>
Water-cooled quasi-doubly bent crystal monochromator for Compton scattering experiments

Hiroshi Kawata, Masato Sato, Toshiaki Iwazumi, Masami Ando, Nobuhiko Sakai, Masahisa Ito, Yoshikazu Tanaka, Nobuhiro Shiotani, Fumitake Itoh, Hiroshi Sakurai, Yoshiharu Sakurai, Yosiyuki Watanabe, Susumu Nanao

Review of Scientific Instruments　1991/09/01

DOI： 10.1063/1.1142375 　

ISSN： 0034-6748 1089-7623

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<jats:p>Commissioning and performance of a water-cooled quasi doubly bent crystal monochromator for Compton scattering experiments are described. The monochromator consists of an array of twenty singly bent crystals. Each crystal is half immersed in liquid Ga-ln alloy contained in a water-cooled holder. This is necessary because the monochromator must be able to withstand heat load of 4 kW from synchrotron radiation from an ellipsoid multipole wiggler at the 6.5 GeV accumulation ring. The alignment procedure for twenty singly bent crystals is described in detail. Its performance is as follows; the focused beam size of 60 keV x rays is about 3 mm (vertical) and 8 mm (horizontal). The flux is 6×1012 photons/s at stored currents of 30 mA and the energy resolution is 88 eV for 60 keV x rays. Heating of various adjusting mechanisms by Compton scattered x rays from both the absorber used to suppress low energy x rays and the monochromator crystals is found to be a very serious problem for designing a high energy x-ray beamline.</jats:p>
Application of circularly polarized x-rays to magnetic Compton-scattering experiments

N. Sakai, M. Ito, H. Kawata, T. Iwazumi, M. Ando, N. Shiotani, F. Itoh, Y. Sakurai, S. Nanao

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　1991/06

DOI： 10.1016/0168-9002(91)90285-x 　

ISSN： 0168-9002
Magnetic XANES of Circularly Polarized X-Ray Absorption on Fe and Ni Metals and Nd₂Fe₁₄B Compound

Hiroshi Maruyama, Toshiaki Iwazumi, Hiroshi Kawata, Akihisa Koizumi, Manabu Fujita, Hiroshi Sakurai, Fumitake Itoh, Kazumichi Namikawa, Hitoshi Yamazaki, Masami Ando

Journal of the Physical Society of Japan　1991/05/15

DOI： 10.1143/jpsj.60.1456 　

ISSN： 0031-9015 1347-4073
Compton-Profile Observation of Conduction-Electron Spin Polarization in Ferromagnetic Gd

Nobuhiko Sakai, Yoshikazu Tanaka, Fumitake Itoh, Hiroshi Sakurai, Hiroshi Kawata, Toshiaki Iwazumi

Journal of the Physical Society of Japan　1991/04/15

DOI： 10.1143/jpsj.60.1201 　

ISSN： 0031-9015 1347-4073
Design and construction of beamline-NE1 for circularly polarized synchrotron radiation from the 6-GeV TRISTAN Accumulation Ring

H. Kawata, T. Miyahara, S. Yamamoto, T. Shioya, H. Kitamura, S. Sato, S. Asaoka, N. Kanaya, A. Iida, A. Mikuni, M. Sato, T. Iwazumi, Y. Kitajima, M. Ando

Review of Scientific Instruments　1989/07/01

DOI： 10.1063/1.1140880 　

ISSN： 0034-6748 1089-7623

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<jats:p>The beamline for the circularly polarized synchrotron radiation at the 6-GeV Accumulation Ring for the TRISTAN project is now under construction. The insertion device of this beamline was designed to produce circularly polarized x rays at the photon energy range of 200 eV∼100 keV. The beamline is divided into the following three branches: (1) High resolution Compton scattering and magnetic Compton scattering experiments; (2) multipurpose experiments such as magnetic x-ray scattering and magnetic x-ray absorption; and (3) completely circularly polarized soft x rays.</jats:p>
Crystal structure and superconductivity in NbSx ()

M. Izumi, T. Iwazumi, R. Yoshizaki, T. Nakayama, E. Matsuura, H. Oyanagi, K. Uchinokura

Synthetic Metals　1989/03

DOI： 10.1016/0379-6779(89)90960-0 　

ISSN： 0379-6779
The 36K and 40K superconductivities of La2CuO4−y

Ryozo Yoshizaki, Hideaki Sawada, Toshiaki Iwazumi, Hiroshi Ikeda

Synthetic Metals　1989/03

DOI： 10.1016/0379-6779(89)90978-8 　

ISSN： 0379-6779
Physical properties of ternary TCNQ compound

M. Izumi, Y. Kajita, T. Iwazumi, T. Sekine, R.M. Lequan, M. Lequan

Synthetic Metals　1988/12

DOI： 10.1016/0379-6779(88)90153-1 　

ISSN： 0379-6779
Anomalous enhancement of fractional volume of superconductivity in La2CuO4−y due to field cooling process

Ryozo Yoshizaki, Hideaki Sawada, Toshiaki Iwazumi, Hiroshi Ikeda

Physica C: Superconductivity　1988/06

DOI： 10.1016/0921-4534(88)90388-7 　

ISSN： 0921-4534
Anomalous enhancement of superconductivity observed in La2CuO4−y

Ryozo Yoshizaki, Hideaki Sawada, Toshiaki Iwazumi, Hiroshi Ikeda

Solid State Communications　1988/03

DOI： 10.1016/0038-1098(88)90647-3 　

ISSN： 0038-1098
Study on copper valency of high-tc superconductor YBa2Cu3O7−y by high temperature X-ray absorption spectroscopy

Toshiaki Iwazumi, Izumi Nakai, Mitsuru Izumi, Hiroyuki Oyanagi, Hideaki Sawada, Hiroshi Ikeda, Yosuke Saito, Yoshihito Abe, Kôki Takita, Ryozo Yoshizaki

Solid State Communications　1988/01

DOI： 10.1016/0038-1098(88)90890-3 　

ISSN： 0038-1098
Infrared properties of the oxygen-deficient triperovskite YBa2Cu3Oy compound

Yosuke Saito, Hideaki Sawada, Toshiaki Iwazumi, Yoshihito Abe, Hiroshi Ikeda, Ryozo Yoshizaki

Solid State Communications　1987/11

DOI： 10.1016/0038-1098(87)91027-1 　

ISSN： 0038-1098
Superconductivity and Crystal Structure of LaBa₂Cu_3-xO_y Compounds

Ryozo Yoshizaki, Hideaki Sawada, Toshiaki Iwazumi, Yosuke Saito, Yoshihito Abe, Hiroshi Ikeda, Katsuhiro Imai, Izumi Nakai

Japanese Journal of Applied Physics　1987/10/01

DOI： 10.1143/jjap.26.l1703 　

ISSN： 0021-4922 1347-4065

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<jats:p> The crystal structure of a sample which shows a superconducting transition onset temperature of 89 K and a transition width of 9 K is determined to be orthorhombic with oxygen-deficient triperovskite structure from Rietveld refinement of X-ray powder diffraction patterns. The crystal data are as follows: LaBa<jats:sub>2</jats:sub>Cu<jats:sub>2.94</jats:sub>O<jats:sub>7</jats:sub>, orthorhombic, space group Pmmm, <jats:italic>a</jats:italic> = 3.8829(1), <jats:italic>b</jats:italic> = 3.9342(4), and <jats:italic>c</jats:italic> = 11.810(1) Å. It is proposed that an orthorhombic structure is essential to the 90 K superconductivity of oxygen-deficient triperovskites and the <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> of their tetragonal forms is around 60 K. </jats:p>
The Dependence of the Superconducting Transition upon the Quench Temperature of YBa₂Cu₃O_y

Hideaki Sawada, Toshiaki Iwazumi, Yosuke Saito, Yoshihito Abe, Hiroshi Ikeda, Ryozo Yoshizaki

Japanese Journal of Applied Physics　1987/06/01

DOI： 10.1143/jjap.26.l1054 　

ISSN： 0021-4922 1347-4065

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<jats:p> The superconducting transition properties have been evaluated for YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub> <jats:italic>y</jats:italic> </jats:sub> compound samples prepared after processing from vairous quench temperatures following a sintering stage at 880°C. Two sets of temperatures depicting the onset of the superconducting transition have been observed. One set is found to cover 79-94 K for samples with orthorhombic symmetry, and the onset temperature increases as the quench temperature is lowered. The other set is found to cover the range 52-58 K for samples with tetragonal symmetry. </jats:p>
Identification of a Structure with Two Superconducting Phases in L-Ba-Cu-O System (L=La or Y)

Toshiaki Iwazumi, Ryozo Yoshizaki, Masahiro Inoue, Hideaki Sawada, Hiroaki Hayashi, Hiroshi Ikeda, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/05/01

DOI： 10.1143/jjap.26.l621 　

ISSN： 0021-4922 1347-4065

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<jats:p> The superconducting transition temperature has been investigated for almost single phase (L<jats:sub>1-<jats:italic>x</jats:italic> </jats:sub>Ba<jats:sub> <jats:italic>x</jats:italic> </jats:sub>)<jats:sub> <jats:italic>a</jats:italic> </jats:sub>Cu<jats:sub> <jats:italic>b</jats:italic> </jats:sub>O<jats:sub> <jats:italic>c</jats:italic>-<jats:italic>y</jats:italic> </jats:sub> compound samples where L stands for La or Y and (<jats:italic>a</jats:italic>,<jats:italic>b</jats:italic>,<jats:italic>c</jats:italic>) values of (6,6,14) respectively and <jats:italic>y</jats:italic> the oxygen deficiency has not been evaluated. The structures have tetragonal symmetry and the superconducting transition temperatures of 50 K and 54 K have been determined for the L=La and L=Y samples respectively. </jats:p>
Superconducting Properties of La_1.85Sr_0.15CuO₄ Made by Hot-Press and Sinter Methods

Ryozo Yoshizaki, Toshiaki Iwazumi, Hideaki Sawada, Hiroshi Ikeda, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/04/01

DOI： 10.1143/jjap.26.l311 　

ISSN： 0021-4922 1347-4065

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<jats:p> The superconducting transition properties were investigated by resistivity and magnetization in La<jats:sub>1.85</jats:sub>Sr<jats:sub>0.1</jats:sub>CuO<jats:sub>4</jats:sub> for hot-pressed and sintered samples. The zero resistance at 34.5 K and the midpoint of the transition at 37.7 K were obtained in the sintered one with the onset temperature of 42 K. A single crystal was obtained in the hot-pressed one. </jats:p>
Weak Flax-Pinning Effect between 230 K and 40 K in La_1.8Sr_0.2CuO₄

Toshiaki Iwazumi, Ryozo Yoshizaki, Hideaki Sawada, Hiroaki Hayashi, Hiroshi Ikeda, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/04/01

DOI： 10.1143/jjap.26.l383 　

ISSN： 0021-4922 1347-4065

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<jats:p> Thermal hysteresis measurement of the magnetization of La<jats:sub>1.8</jats:sub>Sr<jats:sub>0.2</jats:sub>CuO<jats:sub>4</jats:sub> revealed weak flux-pinning effect below 230 K. The hysteresis was observed in weak magnetic field and disappeared above 0.3 T. The result was similar to the flux pinning in type-II superconductors. </jats:p>
Preparation and Property of La_1.85Sr_0.15CuO₄ Single Crystal

Toshiaki Iwazumi, Ryozo Yoshizaki, Hideaki Sawada, Hiromoto Uwe, Tunetaro Sakudo, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/04/01

DOI： 10.1143/jjap.26.l386 　

ISSN： 0021-4922 1347-4065

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<jats:p> A single crystal of the high <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> superconductor, La<jats:sub>1.85</jats:sub>Sr<jats:sub>0.15</jats:sub>CuO<jats:sub>4</jats:sub>, was prepared using the solid phase reaction, and the magnetization was investigated. In the superconducting state, strong anisotropic diamagnetism was observed for external magnetic field parallel and perpendicular to the <jats:italic>c</jats:italic>-axis. This result supports the two-dimensional character of Sr-La-Cu-O system. </jats:p>
Study of the Infrared Properties of (La_1-xSr_x)₂CuO₄

Hideaki Sawada, Yosuke Saito, Toshiaki Iwazumi, Ryozo Yoshizaki, Yoshihito Abe, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/04/01

DOI： 10.1143/jjap.26.l426 　

ISSN： 0021-4922 1347-4065

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<jats:p> Reflectivity and transmission spectra of (La<jats:sub>1-<jats:italic>x</jats:italic> </jats:sub>Sr<jats:sub> <jats:italic>x</jats:italic> </jats:sub>)<jats:sub>2</jats:sub>CuO<jats:sub>4</jats:sub> were measured in the spectral range of 20-4800 cm<jats:sup>-1</jats:sup>. The intensity of the absorption peak around 255 cm<jats:sup>-1</jats:sup> became twice with lowering temperature from 298 to 19 K accompanying weak softening, while the Cu-O asymmetric stretching mode at 510 cm<jats:sup>-1</jats:sup> was almost unchanged both in its energy and intensity. The origin of the soft-phonon mode is discussed. </jats:p>
Magnetization Property of Annealed La_1.85Sr_0.15CuO₄ from 300 K to 5 K

Ryozo Yoshizaki, Toshiaki Iwazumi, Hideaki Sawada, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/04/01

DOI： 10.1143/jjap.26.l316 　

ISSN： 0021-4922 1347-4065

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<jats:p> Magnetization of sintered La<jats:sub>1.85</jats:sub>Sr<jats:sub>0.15</jats:sub>CuO<jats:sub>4</jats:sub> was measured in magnetic field of about 0.0003, 1 and 3 T. As lowering the temperature from 300K, the paramagnetization decreases gradually from about 230 K, changing rapidly to large diamagnetization at 45 K and the diamagnetization increased abruptly at 14 K. The last two temperatures are indicated to the onset temperatures of the superconducting transitions. A tentative model is discussed about the two transitions. </jats:p>
Crystal structure and far-infrared reflectance at 30 K in linear-chain semiconductor (NbSe4)3I

M. Izumi, T. Iwazumi, T. Seino, T. Sekine, E. Matsuura, K. Uchinokura, R. Yoshizaki

Synthetic Metals　1987/03

DOI： 10.1016/0379-6779(87)90466-8 　

ISSN： 0379-6779
Oxygen-Intercalation Effect upon Tetragonal-LaBa2Cu3-xOy Compound Samples

Toshiaki Iwazumi

Novel Superconductivity　1987
EXAFS in NbS_x (x≃3)

Toshiaki Iwazumi, Mitsuru Izumi, Hiroyuki Oyanagi, Ryozo Yoshizaki, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/01/01

DOI： 10.7567/jjaps.26s3.971 　

ISSN： 0021-4922 1347-4065

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<jats:p> The EXAFS spectra were measured on the Nb K-shell absorption in semiconducting NbS<jats:sub>3</jats:sub> and metallic NbS<jats:sub>x</jats:sub> (x≃3). The radial distribution function of semiconductor NbS<jats:sub>3</jats:sub> shows that each metal atom forms Nb–Nb pair, which is identical to the previous results or X-ray structural analysis. The remarkable feature of the radial distribution function of metallic NbS<jats:sub>x</jats:sub> is the appearance of the prominent Nb–Nb peak around 3.0 Å, whose position is just in the middle of two Nb–Nb distances in semiconductor NbS<jats:sub>3</jats:sub>. It clearly shows that in the metallic crystal the Nb–Nb pair is deformed and the one-dimensional Nb chain is undistorted as the bulk-structural property. </jats:p>
Infrared Properties of the High T_c Superconductor (La, Y)–Ba–Cu–O and La–Sr–Cu–O Compounds

Yosuke Saito, Ryozo Yoshizaki, Hideaki Sawada, Toshiaki Iwazumi, Yoshihito Abe, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/01/01

DOI： 10.7567/jjaps.26s3.1011 　

ISSN： 0021-4922 1347-4065

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<jats:p> Infrared transmission spectra were measured in YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>z</jats:sub> prepared by rapid cooling from various temperatures. Two types of spectra have been obtained corresponding to the crystal structures, tetragonal or orthorhomblc. The spectrum of La<jats:sub>0.4</jats:sub>Ba<jats:sub>0.6</jats:sub>CuO<jats:sub>w</jats:sub> whose superconducting transition temperature of 50 K was similar to the spectra of tetragonal-YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>z</jats:sub> compounds and could be distinguished from the spectrum of (La<jats:sub>0.925</jats:sub>Ba<jats:sub>0.075</jats:sub>)<jats:sub>2</jats:sub>CuO<jats:sub>4-y</jats:sub>. </jats:p>
Correlation of Layered Structure and Superconductivity in (La, Y)–Ba–Cu–O System

Toshiaki Iwazumi, Ryozo Yoshizaki, Hideaki Sawada, Yosuke Saito, Hiroshi Ikeda, Yoshihito Abe, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/01/01

DOI： 10.7567/jjaps.26s3.1065 　

ISSN： 0021-4922 1347-4065

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<jats:p> The oxide superconductors In the (La,Y)–Ba–Cu–O system were Investigated by X-ray powder diffraction, electrical resistivity and magnetic susceptibility measurements. In the La–Ba–Cu–O system, we have synthesized the two types of the superconductors by varying only their composition ratio. In the Y–Ba–Cu–O system, the correlation between the onset temperature of the superconducting transition and the oxygen contents was found. </jats:p>
Acoustic Property Measurement of the Oxide Superconductor (La_1-xSr_x)₂CuO₄ by the Sphere Resonance Method

Ryozo Yoriwaki, Takeshi Hikata, Taesu Han, Toshiaki Iwazumi, Hldeaki Sawada, Tunetaro Sakudo, Tetsuro Suzuki, Etsuyuki Matsuura

Japanese Journal of Applied Physics　1987/01/01

DOI： 10.7567/jjaps.26s3.1129 　

ISSN： 0021-4922 1347-4065

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<jats:p> Acoustic-property of sintered (La<jats:sub>1-x</jats:sub>Sr<jats:sub>x</jats:sub>)<jats:sub>2</jats:sub>CuO<jats:sub>4-y</jats:sub> sample has been measured by a sphere-resonance method. Softening of elastic modulus has been ooserved for the samples with x=0.05, 0.075 and 0.1, and not observed for a x=0.2 sample. The softening temperature increased with decreasing x, and was found to be related to an antlferrodlstortlve transition temperature in La<jats:sub>2</jats:sub>CuO<jats:sub>4-y</jats:sub> (x=0). The correlation between the superconducting transition temperature and the softening is discussed. </jats:p>
FORMATION OF LONG-RANGE ORDER NEAR THE 2ND-ORDER PHASE-TRANSITION TEMPERATURE IN (NBSE4)3I Peer-reviewed

T IWAZUMI, M IZUMI, F SASAKI, R YOSHIZAKI, E MATSUURA

PHYSICA B & C　143　(1-3)　261-263　1986/11

ISSN： 0378-4371
STACKING DISORDER IN NBS3 AND ZRS3, ZRSE3 Peer-reviewed

T IWAZUMI, M IZUMI, K UCHINOKURA, R YOSHIZAKI, E MATSUURA

PHYSICA B & C　143　(1-3)　255-257　1986/11

ISSN： 0378-4371
Stacking disorder in NbS3 and ZrX3 (X=S,Se)

Toshiaki Iwazumi, Mitsuru Izumi, Kunimitsu Uchinokura, Ryozo Yoshizaki, Etsuyuki Matsuura

Physica B+C　1986/11

DOI： 10.1016/0378-4363(86)90110-5 　

ISSN： 0378-4363
Formation of long-range order near the second-order phase transition temperature in (NbSe4)3I

Toshiaki Iwazumi, Mitsuru Izumi, Fumio Sasaki, Ryozo Yoshizaki, Etsuyuki Matsuura

Physica B+C　1986/11

DOI： 10.1016/0378-4363(86)90112-9 　

ISSN： 0378-4363
Structural Phase Transition In (Nbse₄)₃I

Mitsuru Izumi, Toshiaki Iwazumi, Kunimitsu Uchinokura, Ryozo Yoshizakiand, Etsuyuki Matsuura

Molecular Crystals and Liquid Crystals　1985/03

DOI： 10.1080/00268948508074824 　

ISSN： 0026-8941
STRUCTURAL PHASE TRANSITIO IN (NBSE4)3I Peer-reviewed

M IZUMI, T IWAZUMI, K UCHINOKURA, R YOSHIZAKI, E MATSUURA

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　121　(1-4)　15-18　1985

ISSN： 0140-6566
X-ray diffraction study of a structural phase transition in (NbSe4)3I

Mitsuru Izumi, Toshiaki Iwazumi, Kunimitsu Uchinokura, Ryozo Yoshizaki, Etsuyuki Matsuura

Solid State Communications　1984/07

DOI： 10.1016/0038-1098(84)90993-1 　

ISSN： 0038-1098
Evidence of a phase transition in a new type of halogenated niobium tetraselenide (NbSe4)xI

Mitsuru Izumi, Toshiaki Iwazumi, Taisaku Seino, Kunimitsu Uchinokura, Ryozo Yoshizaki, Etsuyuki Matsuura

Solid State Communications　1984/02

DOI： 10.1016/0038-1098(84)90655-0 　

ISSN： 0038-1098
X-Ray Diffuse Scattering in Wolffram's Red Salt

Satoshi Iida, Toshiaki Iwazumi, Hikaru Terauchi

Journal of the Physical Society of Japan　1983/08

DOI： 10.1143/jpsj.52.2769 　

ISSN： 0031-9015 1347-4073
Phase Transitions in Superionic Cu_1.8Se

Toshiaki Iwazumi, Satoshi Iida, Hikaru Terauchi

Journal of the Physical Society of Japan　1983/06

DOI： 10.1143/jpsj.52.1884 　

ISSN： 0031-9015 1347-4073
Resistivity Anomalies and Superconductivity in NbS3 Peer-reviewed

M. Izumi, T. Nakayama, R. Yoshizaki, K. Uchinokura, T. Iwazumi, T. Seino, E. Matsuura

Proc. Int. Symp. on Nonlinear Transport and Related Phenomena in Inorganic Quasi One Dimensional Concuctors　301-323　1983

Show all ︎Show first 5

Misc. 54

Temperature Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

手塚泰久, 島村仁章, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

量子ビームサイエンスフェスタ(Web)　2023　2024
Electronic Structure Study of A-site Ordered Perovskite CaCu₃Ti₄O₁₂ by means of X-ray Emission Spectroscopy.

手塚泰久, 島村仁章, IM H., 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

日本物理学会講演概要集(CD-ROM)　79　(1)　2024

ISSN： 2189-079X
UV-radiation Effect on Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

手塚泰久, 島村仁章, IM H., 渡辺孝夫, 野澤俊介, 岩住俊明

日本物理学会講演概要集(CD-ROM)　78　(2)　2023

ISSN： 2189-079X
Temperature Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂

島村仁章, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明, 手塚泰久

量子ビームサイエンスフェスタ(Web)　2022　2023
共鳴X線ラマン散乱による遷移金属酸化物の非占有電子構造の研究

手塚泰久, 浅利真人, 加藤梨紗, 野澤俊介, 中島伸夫, 岩住俊明

日本放射光学会年会・放射光科学合同シンポジウム(Web)　35th　2022
Azimuthal Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

手塚泰久, 浅利真人, 加藤梨紗, IM H., 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

日本物理学会講演概要集(CD-ROM)　77　(1)　2022

ISSN： 2189-079X
Temperaure Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

手塚泰久, 島村仁章, IM H., 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

日本物理学会講演概要集(CD-ROM)　77　(2)　2022

ISSN： 2189-079X
Azimuthal Dependent Electronic Structure of A-site Ordered Perovskite CaCu₃Ti₄O₁₂.

手塚泰久, 浅利真人, 加藤梨紗, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

量子ビームサイエンスフェスタ(Web)　2021　2022
共鳴X線ラマン散乱によるTi酸化物の電子構造の研究

高橋瑞樹, 浅利真人, 加藤梨沙, 野澤俊介, 中島伸夫, 岩住俊明, 手塚泰久

日本放射光学会年会・放射光科学合同シンポジウム(Web)　34th　2021
Unoccupied Electronic Structure of Transition Metal Oxides by means of Resonant X-ray Raman Scattering.

手塚泰久, 高橋瑞樹, 浅利真人, 加藤梨紗, 野澤俊介, 中島伸夫, 岩住俊明

日本物理学会講演概要集(CD-ROM)　76　(1)　2021

ISSN： 2189-079X
Unoccupied Electronic Structure of Transition Metal Oxides by means of Resonant X-ray Raman Scattering: II.

手塚泰久, 浅利真人, 加藤梨紗, 野澤俊介, 中島伸夫, 岩住俊明

日本物理学会講演概要集(CD-ROM)　76　(2)　2021

ISSN： 2189-079X
Unoccupied Electronic Structure of Transition Metal Oxides by means of Resonant X-ray Raman Scattering.

加藤梨紗, 高橋瑞樹, 浅利真人, 野澤俊介, 中島伸夫, 岩住俊明, 手塚泰久

量子ビームサイエンスフェスタ(Web)　2020　2021
共鳴X線ラマン散乱によるSrTiO₃の電子構造の温度依存性

手塚泰久, 上出晴輝, 高橋瑞樹, 野澤俊介, 中島伸夫, 岩住俊明

日本放射光学会年会・放射光科学合同シンポジウム(Web)　33rd　2020
Temperature Dependent Electronic Structure of SrTiO₃ by means of Resonant X-ray Raman Scattering.

高橋瑞樹, 上出晴輝, 野澤俊介, 中島伸夫, 岩住俊明, 手塚泰久

量子ビームサイエンスフェスタ(Web)　2019　2020
共鳴X線ラマン散乱によるAnatase(TiO₂)の電子構造の研究

中本星也, 西山賢司郎, 野沢俊介, 石渡洋一, 岩住俊明, 手塚泰久

日本放射光学会年会・放射光科学合同シンポジウム(Web)　30th　2017
X線ラマン散乱によるCaCu₃Ti₄O₁₂の電子構造の研究

横内悠斗, 三上雅矢, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明, 手塚泰久

日本放射光学会年会・放射光科学合同シンポジウム予稿集　29th　2016
Resonant X-ray Raman Scattering Study of Electronic Structure of Nano-particle Anatase (TiO₂).

中本星也, 横内悠斗, 野沢俊介, 石渡洋一, 岩住俊明, 手塚泰久

量子ビームサイエンスフェスタ(Web)　2015　2016
X線ラマン散乱によるCaCu₃Ti₄O₁₂の電子構造の研究

横内悠斗, 三上雅矢, 手塚泰久, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

物構研サイエンスフェスタ要旨集　3rd　2015
X線ラマン散乱によるCaCu₃Ti₄O₁₂の電子構造の研究

佐々木祐輔, 大浦龍介, 三上雅矢, 手塚泰久, 任皓駿, 渡辺孝男, 野澤俊介, 中島伸夫, 岩住俊明

日本放射光学会年会・放射光科学合同シンポジウム予稿集　27th　2014
X線ラマン散乱によるCaCu₃Ti₄O₁₂の電子構造研究

手塚泰久, 佐々木祐輔, 三上雅矢, 任皓駿, 渡辺孝男, 野沢俊介, 中島伸夫, 岩住俊明, 五十棲泰人

物構研サイエンスフェスタ要旨集　2013　2014
X線ラマン散乱によるCaCu₃Ti₄O₁₂の電子構造の研究

佐々木祐輔, 神翔太, 大浦龍介, 三上雅矢, 手塚泰久, 任皓駿, 渡辺孝夫, 野澤俊介, 中島伸夫, 岩住俊明

物構研サイエンスフェスタ要旨集　1st　2013
共鳴発光分光によるペロブスカイト型チタン酸化物の電気双極子モーメントの直接観測

中島伸夫, 川上修平, 圓山裕, 手塚泰久, 岩住俊明

物構研サイエンスフェスタ要旨集　1st　2013
X線ラマン散乱による強誘電体BaTiO₃の構造相転移の研究

大浦龍介, 手塚泰久, 神翔太, 佐々木祐輔, 中島伸夫, 野澤俊介, 岩住俊明, 五十棲泰人

物構研サイエンスフェスタ要旨集　1st　2013
共鳴X線発光分光によるチタン酸化物の局所構造の研究

中島伸夫, 渡辺剛基, 川上修平, 磯濱陽一, 圓山裕, 手塚泰久, 岩住俊明

PFシンポジウム要旨集　29th　2012
電場印加条件下での発光分光による電子状態観測

中島伸夫, 磯濱陽一, 渡辺剛基, 水牧仁一朗, 河村直己, 手塚泰久, 岩住俊明, 園山裕

PFシンポジウム要旨集　28th　2011
強誘電体BaTiO₃におけるTi K共鳴X線ラマン散乱:Ti2p素励起の温度依存性

手塚泰久, 中川伸一, 篠谷剛志, 惣山浩行, 大浦龍介, 山田匠, 中島伸夫, 野沢俊介, 岩住俊明, 五十棲泰人

PFシンポジウム要旨集　28th　2011
強誘電体BaTiO₃におけるTi K共鳴X線散乱:Ti3p素励起

惣山浩行, 手塚泰久, 中川伸一, 篠谷剛志, 大浦龍介, 山田匠, 野澤俊介, 岩住俊明, 五十棲泰人, 中島伸夫

PFシンポジウム要旨集　28th　2011
ペロブスカイト型チタン酸化物の紫外線誘起Ti一次元振動

中島伸夫, 出口将貴, 圓山裕, 石地耕太朗, 手塚泰久, 岩住俊明

PFシンポジウム要旨集　27th　2010
BaTiO₃の共鳴X線ラマン散乱 III

手塚泰久, 大沢仁志, 野沢俊介, 中島伸夫, 佐藤仁, 岩住俊明, 五十棲泰人

日本放射光学会年会・放射光科学合同シンポジウム予稿集　22nd　2009
共鳴非弾性X線散乱によるペロブスカイト型チタン酸化物の局所構造

中島伸夫, 石松直樹, 圓山裕, 手塚泰久, 岩住俊明

日本放射光学会年会・放射光科学合同シンポジウム予稿集　22nd　2009
Ti酸化物の共鳴X線ラマン散乱

手塚泰久, 岩本貴徳, 大沢仁志, 野澤俊介, 岩住俊明, 五十棲泰人

PFシンポジウム要旨集　25th　2008
BaTiO₃の共鳴X線ラマン散乱

手塚泰久, 藤田康男, 佐々木俊之, 岩本貴徳, 沖恵, 中島伸夫, 大沢仁志, 石地耕太朗, 岩住俊明, 五十棲泰人

PFシンポジウム要旨集　24th　2007
Ti酸化物の共鳴非弾性X線散乱 V

手塚泰久, 岩本貴徳, 大沢仁志, 野澤俊介, 岩住俊明, 五十棲泰人

日本物理学会講演概要集　62　(2)　2007

ISSN： 1342-8349
発光分光によるBaTiO₃ナノ粒子の電子状態の研究

中島伸夫, 沖恵, 石松直樹, 圓山裕, 手塚泰久, 石地耕太朗, 岩住俊明

PFシンポジウム要旨集　24th　2007
BaTiO₃の共鳴X線ラマン散乱 II

手塚泰久, 藤田康男, 佐々木俊之, 岩本貴徳, 沖恵, 中島伸夫, 森本理, 岩住俊明, 五十棲泰人, 室隆桂之, 木下豊彦

日本放射光学会年会・放射光科学合同シンポジウム予稿集　21st　2007
30aPS-41 Photo Induced Phase Transition of CsMnFe(CN)_6 studied by X-ray Spectroscopy

Iwazumi T., Nozawa S., Ohsawa H., Matsuda T., Tokoro Y., Ohkoshi S., Hashimoto K.

Meeting Abstracts of the Physical Society of Japan　59　(0)　764-764　2004
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.59.1.4.0_764_4 　

ISSN： 1342-8349
Photo-Induced Phase Transitions in RbMnFe(CN)_6 observed with X-ray Spectroscopy

Osawa H., Nozawa S., Iwazumi T., Tokoro H., Ohkoshi S., Hashimoto K., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　58　(0)　611-611　2003
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.58.2.4.0_611_2 　

ISSN： 1342-8349
Photo-Induced Spin State Transitions in RbMnFe(CN)_6 observed with XES and XAS 2

Osawa H., Takano T., Nanao S., Isozumi Y., Tokoro H., Ohkoshi S., Hashimoto K., Nazawa S., Iwazumi T., Nakamura T., Shoji H., Hirai E.

Meeting Abstracts of the Physical Society of Japan　58　(0)　690-690　2003
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.58.1.4.0_690_1 　

ISSN： 1342-8349
Spin State Transitions in iron Spin-Crossover complex observed with XES and XAS 2

Osawa H., Isozumi Y., Nanao S., Iwazumi T., Syoji H., Hirai E., Nakamura T., Ogawa Y., Ishikawa T., Koshihara S., Katano R.

Meeting Abstracts of the Physical Society of Japan　56　(0)　600-600　2001
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.56.2.4.0_600_4 　

ISSN： 1342-8349
Magnetic Circular Dichroism of X-ray Emission Spectroscopy coming from 2p4f quadrupolar transition at Sm L_<II> and L_<III> -edges

Nakamura T., Iwazumi T., Syoji H., Watanabe Y., Mizumaki M., Kishimoto S., Katano R., Isozumi Y., Nanao S.

Meeting Abstracts of the Physical Society of Japan　55　(0)　604-604　2000
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.55.2.4.0_604_3 　

ISSN： 1342-8349
Magnetic Circular Dichroism of the X-ray Emission in the Transverse Geometry

Iwazumi T., Shoji H., Miyagawa H., Nakamura T., Nanao S., Katano R., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　55　(0)　612-612　2000
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.55.2.4.0_612_4 　

ISSN： 1342-8349
Magnetic Circular Dichroism of X-ray Emission Spectroscopy for Sm Lα_<1,2>

Nakamura T., Iwazumi T., Syoji H., Watanabe Y., Mizumaki M., Kishimoto S., Katano R., Isozumi Y., Nanao S.

Meeting Abstracts of the Physical Society of Japan　55　(0)　617-617　2000
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.55.1.4.0_617_4 　

ISSN： 1342-8349
Resonant X-ray emission spectroscopy in quasicrystals

Watanabe Y., Nakamura T., Shoji H., Iwazumi T., Mizumaki M., Kishimoto S., Katano R., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　55　(0)　692-692　2000
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.55.1.4.0_692_1 　

ISSN： 1342-8349
Resonant Inelastic X-ray Scattering of Si Single Crystal : Polarizatio and Azimuthal Dependence

Iwazumi T., Shoji H., Nakamura T., Nanao S, Kishimoto S., Katano R., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　55　(0)　620-620　2000
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.55.1.4.0_620_1 　

ISSN： 1342-8349
28a-ZH-5 Magnetic circular dichroism of Co Kα_<1, 2> emission line in a Co metal.

Nakamura T., Iwazumi T., Syoji H., Kishimoto S., Katano R., Isozumi Y., Nanao S.

Meeting Abstracts of the Physical Society of Japan　54　(0)　182-182　1999
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.54.1.2.0_182_4 　

ISSN： 1342-8349
28p-ZH-8 Resonant Inelastic X-ray Scattering in Transition Metal Compounds

Shoji H., Kobayashi K., Nakamura T., Iwazumi T., Katano R., Isozumi Y., Kishimoto S., Nanao S.

Meeting Abstracts of the Physical Society of Japan　54　(0)　192-192　1999
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.54.1.2.0_192_4 　

ISSN： 1342-8349
28p-ZH-7 Reexamination of Si 3p1s Restonant Inelastic X-ray Scattering

Iwazumi T., Nakamura T., Syoji H., Kishimoto S., Katano R., Isozumi Y., Nanao S.

Meeting Abstracts of the Physical Society of Japan　54　(0)　192-192　1999
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.54.1.2.0_192_3 　

ISSN： 1342-8349
25pYC-5 Resonant Inelastic X-ray Scattering in Manganess Compounds.

Shoji H, Iwazumi T, Kobayashi K, Nakamura T, Kishimoto S, Katano R, Isozumi Y, Nanao S

Meeting Abstracts of the Physical Society of Japan　54　(0)　652-652　1999
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.54.2.4.0_652_3 　

ISSN： 1342-8349
25pYC-14 Confimrmation of the Coster-knonig decay in X-ray region by MCD of the emission

Nakamura T, Iwazumi T, Syoji H, Kishimoto S, Katano R, Isozumi Y, Nanao S

Meeting Abstracts of the Physical Society of Japan　54　(0)　654-654　1999
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.54.2.4.0_654_4 　

ISSN： 1342-8349
Composition dependence of MCD of Gd L absorption and emission in amorphous Co-Gd films

NAKAMURA T., NANAO S., SYOJI H., IWAZUMI T., KOBAYASHI K., KISHIMOTO S., KATANO R., ISOZUMI Y., MIZUMAKI M., WATANABE Y.

Meeting Abstracts of the Physical Society of Japan　53　(0)　227-227　1998
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.53.2.2.0_227_1 　

ISSN： 1342-8349
MCD of emissions of GdLα_<1.2>,β_1,β_<2.15>,γ_1 in a Gd ferromagnetic compound.

NAKAMURA T., IWAZUMI T., SYOJI H., KOBAYASHI K., KISHIMOTO S., KATANO R., ISOZUMI Y., NANAO S.

Meeting Abstracts of the Physical Society of Japan　53　(0)　226-226　1998
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.53.2.2.0_226_4 　

ISSN： 1342-8349
5p-G-14 Magnetic Resonance Effect in X-ray Resonant Raman Scattering

Iwazumi T., Kobayashi K., Kishimoto S., Nakamura T., Nanao S., Ohsawa D., Katano R., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　52　(0)　207-207　1997
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.52.2.2.0_207_2 　

ISSN： 1342-8349
5p-G-13 Resonant X-Ray Emission Spectroscopy at the L_3-edge in Rare-Earths

Kobayashi K., Iwazumi T., Kishimoto S., Nakamura T., Nanao S., Ohsawa D., Katano R., Isozumi Y., Maruyama H.

Meeting Abstracts of the Physical Society of Japan　52　(0)　207-207　1997
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.52.2.2.0_207_1 　

ISSN： 1342-8349
7p-X-6 X-ray Magnetic Circular Dichroism of Multi-Electron Excitation by Fluorescence Spectroscopy

Nakamura T., Nanao S., Iwazumi T., Kobayashi K., Kishimoto S., Ohsawa D., Katano R., Isozumi Y.

Meeting Abstracts of the Physical Society of Japan　52　(0)　403-403　1997
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.52.2.2.0_403_3 　

ISSN： 1342-8349

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Research Projects 6

Feasibility Study of Non-Interaction Measurements in X-ray Region

IWAZUMI Toshiaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Osaka Prefecture University

2012/04 - 2015/03

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For realization of the interaction-free measurement in X-ray region, a pilot study was performed using X-ray Mach-Zehnder interferometer. Obtained experimental result in X-ray region using X-ray interferometer was equal to that in visible-light region. At the same time, we found out that stability of X-ray interferometer has a fatal influence. At the present time, we judged that any more study continuation was impossible except performing an extra-large-scale stabilization measure of interferometer.
Magnetic Circular Dichroism of X-ray Emission Spectra of Magnetic Materials

IWAZUMI Toshiaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: High Energy Accelerator Research Organization

1998 - 1999

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With a new apparatus supplied by this grant-in -aid and the existing secondary x-ray spectrometer, the following scientific results were obtained ; 1. Confirmation of the magnetic circular dichroism (MCD) of all Gd L emission lines of the ferrimagnetic Gd compounds. 2. Composition dependence of the MCD of the Gd L emission line of the ferrimagnetic Gd compounds. 3. MCD of the L emission lines of the rare-earth metals of R-Co (R : rare-earth metal) amorphous. These experimental results support and confirm the theoretical predictions that were developed at the almost same time with this project. For 1, especially, there are two different theoretical predictions from the two independent theoretical groups, and the experimental results were waiting to confirm it. Our results clearly showed that the one side prediction is correct. 4. MCD of the K emission lines of the transition metal. The K emissions of the transition metal have almost no MCD in principles, but we observed it at the K absorption edge of the pure Co. 5. Observation of the Beutler-Fano resonance effects in the Gd 3dィイD25/2ィエD22pィイD23/2ィエD2 emission and its MCD when the incident photon energy is near to Gd LィイD22ィエD2 absorption edge. 6. Observations of the emission MCD in the transverse configuration and its scattering angle dependence. Beutler-Fano resonance and the MCD in the Transverse configuration are observed by the photoelectron spectroscopy that is a first-order optical process. We discovered the same effects in the x-ray emission that is a second-order optical process.
Development of new techniques for the analysis of magnetic structures using third-generation synchrotron X-ray sources

HASHIZUME Hiroo, YAMAGUCHI Yuichi, OKUDA Hiroshi, HOSOITO Nobuyoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B).

1998 - 1999

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The highly intense, parallel and polarized X-rays obtained from a third-generation synchrotron source has been converted into circular polarized X-rays using a diamond phase plate, which is used to develop a new technique for the determination of the magnetic structures of metal multilayers. The X-ray energy is tuned close to the adsorption edge of magnetic atoms to enhance the magnetic scattering . The K and L adsorption edges of the 3d and 4f metals are nicely located on the source spectrum of synchrotron X-rays. The difference scattering intensity measured using right and left circular structure. The specular reflection enables the out-of-plane distribution of the local magnetizations to be determined and the diffuse scattering provides information on the interface structure. The method features (1)the separate determination of the magnetic structures due to distinct magnetic atom species, (2)the analysis of the in-plane twist angles of local magnetizations by collecting X-ray data using two scattering planes with distinct azimuthal orientations and (3)the high momentum and special resolution. The joint Japan-US researchers at the Advanced Photon Source and the Spring-8 resulted in the determination of the magnetization structures and the interface magnetic structures of a [Fe(3.5nm)/Gd(5.4nm)]ィイD215ィエD2 multilayer. the result was reported in the Gordon Research Conference and the 6th International Conference on Surface X-rya and Neutron Scattering.
X線ラマン散乱の磁気円二色性測定

岩住俊明

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 高エネルギー物理学研究所

1994 - 1994

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磁性体の研究に有効な手段として近年X線磁気円二色性測定法が開発されたが、この測定法は実験方法の性質上試料の異方性に関する情報が得られないという欠点を有している。X線ラマン散乱の磁気円二色性を測定することによりその欠点が克服されると考え、その測定を行うべく2次X線分光系を製作し、予備的な測定を行った。予備実験のX線光源としては高エネルギー物理学研究所放射光実験施設のビームライン28Bを用いた。2次X線分光系は、発光源(試料)・分光結晶・検出部を同一円周上に配置する反射型収束湾曲分光法とし、分光結晶としてJohan型のSi単結晶を用いた。今回製作した2次X線分光系ではエネルギースキャンは出来ないので分光するエネルギーを6.7keVに固定し、入射X線をエネルギースキャンして測定を行った。試料としてグラファイトやベリル等原子量の小さい元素のみを含むものを用いて、コンプトン散乱やラマン散乱を確認することに成功し、また系全体でのエネルギー分解能がX線ラマン散乱の磁気円二色性測定に必要と思われる2eV以下になっていることが確認できた。磁性物であるニッケルの単結晶を試料とした測定も行ってみたが、非弾性散乱は全くとらえることが出来なかった。予備実験から今後の実験の進め方がかなり制限されることがはっきりした。進め方の一つは高エネルギーでの実験を行うことであるが、高エネルギーにするとエネルギー分解能の劣化が避けられず、X線ラマン散乱の磁気円二色性測定に必要なエネルギー分解能が得られない可能性が大きい。現在満足のいくエネルギー分解能を保ったままどの程度まで高エネルギー化出来るのかどうか検討中である。
磁気X線円二色性における電気双極子遷移と四重極遷移の分離

岩住俊明

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 高エネルギー物理学研究所

1991 - 1991
Ｘ線分光の基礎研究、Ｘ線分光を用いた光誘起相転移研究 Competitive

1988 -

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Ｘ線分光の未解決な基礎的特性に関する研究、及びその応用としての光誘起相転移研究

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