Details of the Researcher

PHOTO

Kousuke Ishida
Section
Institute for Materials Research
Job title
Assistant Professor
Degree

  • 博士（科学）（東京大学）

  • 修士（科学）（東京大学）

Researcher ID
MZS-0471-2025

Research History 1

  • 2021/04 - 2023/05
    Japan Society for the Promotion of Science　JSPS Overseas Research Fellowships

Education 2

  • The University of Tokyo　Graduate School of Frontier Sciences

    2016/04 - 2021/03

  • The University of Tokyo　The Faculty of Engineering　Department of Applied Physics

    2012/04 - 2016/03

Committee Memberships 1

  • Gordon Research Seminar on Superconductivity　Chair

    - 2023/04

Research Areas 1

  • Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Papers 19

  1. Thermodynamic signatures of diagonal nematicity in RbFe2As2 superconductor

    Yuta Mizukami, Ohei Tanaka, Kousuke Ishida, Asato Onishi, Yoichi Kageyama, Masaya Tsujii, Ryotaro Ohno, Noriaki Kimura, Takaya Mitsui, Shinji Kitao, Masayuki Kurokuzu, Makoto Seto, Shigeyuki Ishida, Akira Iyo, Hiroshi Eisaki, Kenichiro Hashimoto, Takasada Shibauchi

    PNAS Nexus　2025/03/27

    DOI： 10.1093/pnasnexus/pgaf060 　

  2. Coherence Length of Electronic Nematicity in Iron-Based Superconductors

    Yoichi Kageyama, Asato Onishi, Cédric Bareille, Kousuke Ishida, Yuta Mizukami, Shigeyuki Ishida, Hiroshi Eisaki, Kenichiro Hashimoto, Toshiyuki Taniuchi, Shik Shin, Hiroshi Kontani, Takasada Shibauchi

    Journal of the Physical Society of Japan　93　(10)　2024/10/15

    Publisher: Physical Society of Japan

    DOI： 10.7566/jpsj.93.103702 　

    ISSN： 0031-9015

    eISSN： 1347-4073

  3. Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa2Cu3Oy

    I. Vinograd, Sofia Michaela Souliou, A.A. Haghighirad, Tom Lacmann, Y. Caplan, M. Frachet, Michael Merz, Gaston Garbarino, Yiran Liu, Suguru Nakata, Kousuke Ishida, Hilary Noad, Matteo Minola, Bernhard Keimer, Dror Orgad, Clifford Hicks, Matthieu Le Tacon

    Nature Communications　2024/04/16

    DOI： 10.1038/s41467-024-47540-w 　

    ISSN： 2041-1723

    More details Close

    <jats:title>Abstract</jats:title><jats:p>Uniaxial pressure provides an efficient approach to control charge density waves in YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>y</jats:sub>. It can enhance the correlation volume of ubiquitous short-range two-dimensional charge-density-wave correlations, and induces a long-range three-dimensional charge density wave, otherwise only accessible at large magnetic fields. Here, we use x-ray diffraction to study the strain dependence of these charge density waves and uncover direct evidence for a form of competition between them. We show that this interplay is qualitatively described by including strain effects in a nonlinear sigma model of competing superconducting and charge-density-wave orders. Our analysis suggests that strain stabilizes the 3D charge density wave in the regions between disorder-pinned domains of 2D charge density waves, and that the two orders compete at the boundaries of these domains. No signatures of discommensurations nor of pair density waves are observed. From a broader perspective, our results underscore the potential of strain tuning as a powerful tool for probing competing orders in quantum materials.</jats:p>

  4. Test of Superconducting Electron Pairing Mediated by Quantum Liquid Crystal Fluctuations

    石田浩祐, 芝内孝禎

    日本物理学会誌　79　(2)　2024

    ISSN： 0029-0181

  5. Giant lattice softening at a Lifshitz transition in Sr2RuO4

    H. M. L. Noad, K. Ishida, Y.-S. Li, E. Gati, V. Stangier, N. Kikugawa, D. A. Sokolov, M. Nicklas, B. Kim, I. I. Mazin, M. Garst, J. Schmalian, A. P. Mackenzie, C. W. Hicks

    Science　282　(6669)　2023/10/27

    DOI： 10.1126/science.adf3348 　

    ISSN： 1095-9203 0036-8075

  6. Expanded quantum vortex liquid regimes in the electron nematic superconductors FeSe1−xSx and FeSe1−xTex

    M. Čulo, S. Licciardello, K. Ishida, K. Mukasa, J. Ayres, J. Buhot, Y.-T. Hsu, S. Imajo, M. W. Qiu, M. Saito, Y. Uezono, T. Otsuka, T. Watanabe, K. Kindo, T. Shibauchi, S. Kasahara, Y. Matsuda, N. E. Hussey

    Nature Communications　14　(1)　2023/07/12

    DOI： 10.1038/s41467-023-39730-9 　

    ISSN： 2041-1723

  7. Enhanced Superconducting Pairing Strength near a Pure Nematic Quantum Critical Point

    Kiyotaka Mukasa, Kousuke Ishida, Shusaku Imajo, Mingwei Qiu, Mikihiko Saito, Kohei Matsuura, Yuichi Sugimura, Supeng Liu, Yu Uezono, Takumi Otsuka, Matija Čulo, Shigeru Kasahara, Yuji Matsuda, Nigel E. Hussey, Takao Watanabe, Koichi Kindo, Takasada Shibauchi

    Physical Review X　13　(1)　2023/03/06

    DOI： 10.1103/PhysRevX.13.011032 　

    ISSN： 2160-3308

  8. μSR measurements on Sr2RuO4 under 〈110〉 uniaxial stress

    Vadim Grinenko, Rajib Sarkar, Shreenanda Ghosh, Debarchan Das, Zurab Guguchia, Hubertus Luetkens, Ilya Shipulin, Aline Ramires, Naoki Kikugawa, Yoshiteru Maeno, Kousuke Ishida, Clifford W. Hicks, Hans-Henning Klauss

    Physical Review B　107　(2)　2023/01/24

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.107.024508 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  9. Normal-state charge transport in YBa2Cu3O6.67 under uniaxial stress

    S. Nakata, P. Yang, M. E. Barber, K. Ishida, H.-H. Kim, T. Loew, M. Le Tacon, A. P. Mackenzie, M. Minola, C. W. Hicks, B. Keimer

    npj Quantum Materials　7　(1)　2022/12/20

    DOI： 10.1038/s41535-022-00532-9 　

    ISSN： 2397-4648

  10. Charge Transport in Ba1−xRbxFe2As2 Single Crystals

    Masaya Tsujii, Kousuke Ishida, Shigeyuki Ishida, Yuta Mizukami, Akira Iyo, Hiroshi Eisaki, Takasada Shibauchi

    Journal of the Physical Society of Japan　91　(10)　2022/10/15

    DOI： 10.7566/JPSJ.91.104706 　

    ISSN： 1347-4073 0031-9015

  11. Pure nematic quantum critical point accompanied by a superconducting dome

    Kousuke Ishida, Yugo Onishi, Masaya Tsujii, Kiyotaka Mukasa, Mingwei Qiu, Mikihiko Saito, Yuichi Sugimura, Kohei Matsuura, Yuta Mizukami, Kenichiro Hashimoto, Takasada Shibauchi

    Proceedings of the National Academy of Sciences　119　(18)　2022/04/29

    Publisher: Proceedings of the National Academy of Sciences

    DOI： 10.1073/pnas.2110501119 　

    ISSN： 0027-8424

    eISSN： 1091-6490

    More details Close

    Significance The notion of the quantum critical point (QCP) is at the core of modern condensed matter physics. Near a QCP of the symmetry-breaking order, associated quantum-mechanical fluctuations are intensified, which can lead to unconventional superconductivity. Indeed, dome-shaped superconducting phases are often observed near the magnetic QCPs, which supports the spin fluctuation–driven superconductivity. However, the fundamental question remains as to whether a nonmagnetic QCP of electronic nematic order characterized by spontaneous rotational symmetry breaking can promote superconductivity in real materials. Here, we provide an experimental demonstration that a pure nematic QCP exists near the center of a superconducting dome in nonmagnetic FeSeTex. This result evidences that nematic fluctuations enhanced around the nematic QCP can boost superconductivity.

  12. Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr2(Ir1−xRhx)O4

    H. Murayama, K. Ishida, R. Kurihara, T. Ono, Y. Sato, Y. Kasahara, H. Watanabe, Y. Yanase, G. Cao, Y. Mizukami, T. Shibauchi, Y. Matsuda, S. Kasahara

    Physical Review X　11　(1)　2021/02/02

    DOI： 10.1103/PhysRevX.11.011021 　

    ISSN： 2160-3308

  13. High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

    K. Mukasa, K. Matsuura, M. Qiu, M. Saito, Y. Sugimura, K. Ishida, M. Otani, Y. Onishi, Y. Mizukami, K. Hashimoto, J. Gouchi, R. Kumai, Y. Uwatoko, T. Shibauchi

    Nature Communications　12　(1)　2021/01/15

    DOI： 10.1038/s41467-020-20621-2 　

    ISSN： 2041-1723

  14. 銅酸化物高温超伝導体における新しいタイプの臨界点

    石田浩祐, 芝内孝禎

    固体物理　56　(6)　2021

    ISSN： 0454-4544

  15. Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3 Peer-reviewed

    Suguru Hosoi, Takuya Aoyama, Kousuke Ishida, Yuta Mizukami, Kazuki Hashizume, Satoshi Imaizumi, Yoshinori Imai, Kenya Ohgushi, Yusuke Nambu, Motoi Kimata, Shojiro Kimura, Takasada Shibauchi

    PHYSICAL REVIEW RESEARCH　2　(4)　2020/11/17

    DOI： 10.1103/PhysRevResearch.2.043293 　

    eISSN： 2643-1564

  16. Divergent Nematic Susceptibility near the Pseudogap Critical Point in a Cuprate Superconductor

    Kousuke Ishida, Suguru Hosoi, Yuki Teramoto, Tomohiro Usui, Yuta Mizukami, Kenji Itaka, Yuji Matsuda, Takao Watanabe, Takasada Shibauchi

    Journal of the Physical Society of Japan　89　(6)　064707-064707　2020/06/15

    Publisher: Physical Society of Japan

    DOI： 10.7566/jpsj.89.064707 　

    ISSN： 0031-9015

    eISSN： 1347-4073

  17. Novel electronic nematicity in heavily hole-doped iron pnictide superconductors

    Kousuke Ishida, Masaya Tsujii, Suguru Hosoi, Yuta Mizukami, Shigeyuki Ishida, Akira Iyo, Hiroshi Eisaki, Thomas Wolf, Kai Grube, Hilbert v. Löhneysen, Rafael M. Fernandes, Takasada Shibauchi

    Proceedings of the National Academy of Sciences　117　(12)　6424-6429　2020/03/12

    Publisher: Proceedings of the National Academy of Sciences

    DOI： 10.1073/pnas.1909172117 　

    ISSN： 0027-8424

    eISSN： 1091-6490

    More details Close

    Significance Strongly correlated electron systems often exhibit exotic states of matter, and perhaps the most surprising is the electronic nematicity with broken rotational symmetry. In such nematic states, the nematic director usually points to certain directions of the underlying crystal, and, thus, these states have been classified as Ising-type. Here, we find in a heavily hole-doped iron-pnictide system that the director is rotated by 45° from the Fe–Fe direction. Moreover, there is a doping range that shows a signature of a class of electronic quantum liquid-crystalline state of XY type, where the nematic director can point anywhere in the Fe planes. These findings reveal another type of quantum liquid crystals, which are expected to host several unique quantum many-body phenomena.

  18. Maximizing T c by tuning nematicity and magnetism in FeSe1−x S x superconductors

    K. Matsuura, Y. Mizukami, Y. Arai, Y. Sugimura, N. Maejima, A. Machida, T. Watanuki, T. Fukuda, T. Yajima, Z. Hiroi, K. Y. Yip, Y. C. Chan, Q. Niu, S. Hosoi, K. Ishida, K. Mukasa, S. Kasahara, J.-G. Cheng, S. K. Goh, Y. Matsuda, Y. Uwatoko, T. Shibauchi

    Nature Communications　8　(1)　2017/10/26

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-017-01277-x 　

    eISSN： 2041-1723

    More details Close

    Abstract A fundamental issue concerning iron-based superconductivity is the roles of electronic nematicity and magnetism in realising high transition temperature (Tc). To address this issue, FeSe is a key material, as it exhibits a unique pressure phase diagram involving non-magnetic nematic and pressure-induced antiferromagnetic ordered phases. However, as these two phases in FeSe have considerable overlap, how each order affects superconductivity remains perplexing. Here we construct the three-dimensional electronic phase diagram, temperature (T) against pressure (P) and isovalent S-substitution (x), for FeSe1−xSx. By simultaneously tuning chemical and physical pressures, against which the chalcogen height shows a contrasting variation, we achieve a complete separation of nematic and antiferromagnetic phases. In between, an extended non-magnetic tetragonal phase emerges, where Tc shows a striking enhancement. The completed phase diagram uncovers that high-Tc superconductivity lies near both ends of the dome-shaped antiferromagnetic phase, whereas Tc remains low near the nematic critical point.

  19. Nematic quantum critical point without magnetism in FeSe 1− x S x superconductors

    Suguru Hosoi, Kohei Matsuura, Kousuke Ishida, Hao Wang, Yuta Mizukami, Tatsuya Watashige, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi

    Proceedings of the National Academy of Sciences　113　(29)　8139-8143　2016/07/05

    Publisher: Proceedings of the National Academy of Sciences

    DOI： 10.1073/pnas.1605806113 　

    ISSN： 0027-8424

    eISSN： 1091-6490

    More details Close

    Significance The electronic nematic order that spontaneously breaks rotational symmetry of the system is perhaps one of the most surprising states of matter. A key issue is the relationship between the fluctuations of such nematic order and high-temperature superconductivity in cuprates and iron pnictides. However, because of coexisting antiferromagnetic or charge density wave orders, it is difficult to pinpoint the impact of nematic fluctuations on superconductivity. Here we report a quantum critical point (QCP) of pure nematic order without accompanying other orders in FeSe 1− x S x superconductors. We find that the nematic fluctuations are divergently enhanced at the nematic QCP. This discovery opens up a new avenue to study the unconventional superconductivity mediated by exotic mechanisms different from the well-studied spin fluctuations.

Show all ︎Show first 5

Misc. 7

  1. High-resolution measurement of specific heat on Iron-based superconductor (Rb,Ba)Fe2As2

    Tanaka O., Mizukami Y., Ishida K., Tsujii M., Ishida S., Iyo A., Eisaki H., Wolf. T, K Grube., Loehneysen Hilbert v., Shibauchi T.

    Meeting Abstracts of the Physical Society of Japan　73.2　1499-1499　2018

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.73.2.0_1499 　

    eISSN： 2189-0803

  2. A novel electronic nematic state in Ba1-xRbxFe2As2

    Ishida K., Tsujii M., Hosoi S., Mizukami Y., Ishida S., Iyo A., Eisaki H., Wolf. T, K Grube., Loehneysen Hilbert v., Shibauchi T.

    Meeting Abstracts of the Physical Society of Japan　73.2　1498-1498　2018

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.73.2.0_1498 　

    eISSN： 2189-0803

  3. Single crystal growth and characterization of Ba1-xRbxFe2As2

    Tsujii M., Ishida K., Hosoi S., Mizukami Y., Ishida S., Iyo A., Eisaki H., Wolf. T, K Grube., Loehneysen Hilbert v., Shibauchi T.

    Meeting Abstracts of the Physical Society of Japan　73.2　1497-1497　2018

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.73.2.0_1497 　

    eISSN： 2189-0803

  4. Fe(Se,S)純良単結晶における高圧下X線回折

    水上雄太, 松浦康平, 細井優, 石田浩祐, 綿重達哉, 笠原成, 前島尚行, 町田晃彦, 綿貫徹, 福田竜生, 矢島健, 廣井善二, 松田祐司, 芝内孝禎

    日本物理学会講演概要集(CD-ROM)　72　(1)　ROMBUNNO.18aL42‐13-2078　2017/03/21

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.72.1.0_2078 　

    ISSN： 2189-079X

  5. 鉄系超伝導体FeSe1-xSxにおけるネマティック量子臨界点の研究

    細井優, 松浦康平, 石田浩祐, WANG Hao, 水上雄太, 綿重達哉, 笠原成, 松田祐司, 芝内孝禎

    日本物理学会講演概要集(CD-ROM)　71　(2)　ROMBUNNO.13pJA‐7-1770　2016/09/23

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_1770 　

    ISSN： 2189-079X

  6. FeSeの高圧下高温超伝導相近傍の結晶構造

    松浦康平, 細井優, 石田浩祐, 水上雄太, 綿重達哉, 笠原成, 前島尚行, 町田晃彦, 綿貫徹, 福田竜生, 松田祐司, 芝内孝禎

    日本物理学会講演概要集(CD-ROM)　71　(2)　ROMBUNNO.15pJA‐3-2175　2016/09/23

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_2175 　

    ISSN： 2189-079X

  7. Measurements of the nematic susceptibility in high-T_c cuprate superconductors

    Ishida K., Hosoi S., Matsuura K., Mizukami Y., Usui T., Watanabe T., Shibauchi T.

    Meeting Abstracts of the Physical Society of Japan　71　2452-2452　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_2452 　

    ISSN： 2189-079X

Show all ︎Show first 5

Research Projects 2

  1. New spin functionality explored by a strain gradient control

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2024/04/01 - 2026/03/31

  2. Study of rotational symmetry breaking in superconductors via uniaxial-pressure measurements

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for JSPS Fellows

    Institution: The University of Tokyo

    2019/04/25 - 2021/03/31