研究者詳細

顔写真

ラ　クンイ
Luo Junyi
Luo Junyi
所属
金属材料研究所　附属強磁場超伝導材料研究センター　強磁場センター
職名
助教
学位

  • 工学博士 （東北大学）

e-Rad 研究者番号
71005725

研究キーワード 2

  • 鉄系超伝導体

  • 超伝導

論文 5

  1. Solid-state potassium fluoride doping strategy for stable fabrication of iron-based superconductors 査読有り

    He Huang, Chao Yao, Chiheng Dong, Meng Han, Minghui Tang, Chen Guo, Yanchang Zhu, Cong Liu, Peng Yang, Xianping Zhang, Dongliang Wang, Hongjun Ma, Fang Liu, Huajun Liu, Jinggang Qin, Junyi Luo, Satoshi Awaji, Yanwei Ma

    Superconductivity　2025年10月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.supcon.2025.100208 　

    ISSN：2772-8307

  2. Asymmetric Stress Engineering of Dense Dislocations in Brittle Superconductors for Strong Vortex Pinning 査読有り

    Meng Han, Chiheng Dong, Chao Yao, Zhihao Zhang, Qinghua Zhang, Yue Gong, He Huang, Dongliang Gong, Dongliang Wang, Xianping Zhang, Fang Liu, Yuping Sun, Zengwei Zhu, Jianqi Li, Junyi Luo, Satoshi Awaji, Xiaolin Wang, Jianxin Xie, Hideo Hosono, Yanwei Ma

    Advanced Materials　2025年8月22日

    出版者・発行元： Wiley

    DOI： 10.1002/adma.202513265 　

    ISSN：0935-9648

    eISSN：1521-4095

    詳細を見る 詳細を閉じる

    Abstract Large lossless currents in high‐temperature superconductors (HTS) critically rely on dense defects with suitable size and dimensionality to pin vortices, with dislocations being particularly effective due to their 1D geometry to interact extensively with vortex lines. However, in non‐metallic compounds such as HTS with rigid lattices, conventional deformation methods typically lead to catastrophic fracture rather than dislocation‐mediated plasticity, making it a persistent challenge to introduce dislocations at high density. Here, an asymmetric stress field strategy is proposed using extrusion to directly nucleate a high density of dislocations in HTS by activating shear‐driven lattice slip and twisting under superimposed hydrostatic compression. As demonstrated in iron‐based superconductors (IBS), atomic displacements of ≈1 Å trigger the formation of tilted dislocation lines with a density approaching that of metals. With further structural refinement, these dislocations serve as strong pinning centers that lead to a fivefold enhancement in the current‐carrying capacity of IBS at 33 tesla (T), along with low anisotropy and a large irreversibility field. This work not only establishes a scalable route to engineer pinning landscapes in HTS but also offers a generalizable framework for manipulating dislocation structures in rigid crystalline systems.

  3. Co-doping with BaSnO3 and BaHfO3 by ultra-high rate PLD enabling formation of high-density nanocolumns in EuBa2Cu3O7-δ films 査読有り

    Yue Wu, Mengrui Zhao, Yuji Tsuchiya, Tatsunori Okada, Junyi Luo, Satoshi Awaji, Yawei Wang, Yue Zhao

    Superconductor Science and Technology　2025年5月1日

    DOI： 10.1088/1361-6668/add428 　

  4. Anisotropic magnetic-field hysteresis behaviors in 7-filamentary Cu/Ag-sheathed Ba1−xKxFe2As2 tapes 査読有り

    Junyi Luo, Tatsunori Okada, Cong Liu, Yanwei Ma, Satoshi Awaji

    Journal of Applied Physics　2025年4月21日

    DOI： 10.1063/5.0260204 　

  5. Flux Pinning Properties of 7-Filament Cu/Ag-Sheathed Ba1-xKxFe2As2 Tapes at 4.2 K 査読有り

    Junyi Luo, Tatsunori Okada, Satoshi Awaji, Cong Liu, Yanwei Ma

    IEEE Transactions on Applied Superconductivity　2023年8月

    DOI： 10.1109/TASC.2023.3263331 　

講演・口頭発表等 14

  1. Electromechanical Properties of 7-filament Cu/Ag-sheathed Ba1-xKxFe2As2 Tapes 招待有り

    Junyi Luo, Tatsunori Okada, Cong Liu, Yanwei Ma, Satoshi Awaji

    3rdWMC/9thWMS/IUMRS-ICA2025　2025年10月16日

  2. Flux Pinning Properties of High-performance Stainless Steel /Ag-sheathed Ba122 Tapes 招待有り

    Junyi Luo, Meng Han, Shunsuke Kume, Yuji Tsuchiya, Yanwei Ma, Satoshi Awaji

    17th European Conference on Applied Superconductivity (EUCAS2025)　2025年9月24日

  3. パルス電流測定による高性能ステンレス鋼/銀シースBa1-xKxFe2As2テープの輸送特性

    羅 珺怡, 久米 俊輔, 土屋 雄司, 淡路 智, 韓 萌, 馬 衍偉

    2025年度春季 第109回 低温工学・超電導学会研究発表会　2025年5月29日

  4. Transport Properties of the Stainless Steel/Ag-sheathed Ba1-xKxFe2As2 Tapes with Large Critical Current Density

    Junyi Luo, Tatsunori Okada, Meng Han, Yanwei Ma, Satoshi Awaji

    Iron-based Superconductors: Advances towards applications 2025 (IBS2app 2025)　2025年2月14日

  5. Anisotropy of Critical Current Density Properties of the High-performance SS/Ag-sheathed Ba1-xKxFe2As2 Tapes

    Junyi Luo, Tatsunori Okada, Meng Han, Yanwei Ma, Satoshi Awaji

    The 37th International Symposium on Superconductivity (ISS2024)

  6. Anisotropy of Critical Current Density Properties of the High-performance SS/Ag-sheathed Ba1-xKxFe2As2 Tapes

    Junyi Luo, Tatsunori Okada, Meng Han, Yanwei Ma, Satoshi Awaji

    Summit of Materials Science 2024 and GIMRT User Meeting 2024

  7. Anisotropic Hysteresis Behaviors in 7-filamentary Cu/Ag-Ba1-xKxFe2As2 Tapes

    Junyi Luo, Tatsunori Okada, Satoshi Awaji, Cong Liu, Yanwei Ma

    16th European Conference on Applied Superconductivity (EUCAS2023)

  8. Flux pinning properties without hysteresis in the Cu/Ag-sheathed Ba1-xKxFe2As2 tapes at 4.2 K

    Junyi Luo, Tatsunori Okada, Satoshi Awaji, Cong Liu, Yanwei Ma

    The Applied Superconductivity Conference 2022 (ASC 2022)

  9. Cu/Ag-Ba₁₋ₓKₓFe₂As₂ 多芯テープにおける臨界電流の磁場および角度ヒステリシス特性

    第83回 応用物理学会 秋季学術講演会 (JSAP 2022)

  10. Hysteresis Behaviors in Magnetic Field and Angular Dependences of Critical Current of Ba1-xKxFe2As2 tapes

    J. Luo, T. Okada, T. Suzuki, S. Awaji, H. Huang, X. Zhang, Y. Ma

    Materials Research Meeting 2021 (MRM2021)

  11. Magnetic field and angular hysteresis properties of the critical current in the Ba1-xKxFe2As2 tapes 招待有り

    Junyi Luo, Takumi Suzuki, Tatsunori Okada, Satoshi Awaji, He Huang, Xianping Zhang, Yanwei Ma

    15th European Conference on Applied Superconductivity (EUCAS 2021)

  12. Ag/(Ba, K)Fe₂As₂ テープの臨界電流密度の異方性とスケーリング

    2020年度秋季 第100回 低温工学・超電導学会研究発表会 (CSSJ 2020)

  13. Ag/(Ba, K)Fe₂As₂ テープの臨界電流密度の異方性とスケーリング

    第139 回 金属材料研究所講演会

  14. Critical current properties of Ag/(Ba,K)Fe2As2 tapes

    Junyi Luo, Tatsunori Okada, Satoshi Awaji, He Huang, Chao Yao, Xianping Zhang, Yanwei Ma

    10th Asian Conference on Applied Superconductivity and Cryogenics (ACASC), 2nd International Cryogenic Materials Conference in Asia (Asian-ICMC), and the Cryogenics and Superconductivity Society of Japan (CSSJ) Joint Conference (10th ACASC/2nd Asian-ICMC/CSSJ)

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