Details of the Researcher

PHOTO

Luo Junyi
Section
Institute for Materials Research
Job title
Assistant Professor
Degree
e-Rad No.
71005725

Research Interests 2

  • 鉄系超伝導体

  • 超伝導

Papers 5

  1. Solid-state potassium fluoride doping strategy for stable fabrication of iron-based superconductors Peer-reviewed

    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　2025/10

    Publisher: 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 Peer-reviewed

    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　2025/08/22

    Publisher: Wiley

    DOI： 10.1002/adma.202513265 　

    ISSN： 0935-9648

    eISSN： 1521-4095

    More details Close

    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 Peer-reviewed

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

    Superconductor Science and Technology　2025/05/01

    DOI： 10.1088/1361-6668/add428 　

  4. Anisotropic magnetic-field hysteresis behaviors in 7-filamentary Cu/Ag-sheathed Ba1−xKxFe2As2 tapes Peer-reviewed

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

    Journal of Applied Physics　2025/04/21

    DOI： 10.1063/5.0260204 　

  5. Flux Pinning Properties of 7-Filament Cu/Ag-Sheathed Ba1-xKxFe2As2 Tapes at 4.2 K Peer-reviewed

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

    IEEE Transactions on Applied Superconductivity　2023/08

    DOI： 10.1109/TASC.2023.3263331 　

Presentations 14

  1. Electromechanical Properties of 7-filament Cu/Ag-sheathed Ba1-xKxFe2As2 Tapes Invited

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

    3rdWMC/9thWMS/IUMRS-ICA2025　2025/10/16

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

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

    17th European Conference on Applied Superconductivity (EUCAS2025)　2025/09/24

  3. Transport Properties of High-Performance Stainless Steel/Ag-Sheathed Ba1-xKxFe₂As₂ Tapes Measured by Pulsed Current

    LUO Junyi, KUME Shunsuke, TSUCHIYA Yuji, AWAJI Satoshi, HAN Meng, MA Yanwei

    2025/05/29

  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)　2025/02/14

  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. Magnetic Field and Angular Hysteresis Behaviors of Critical Current in the Multifilamentary Cu/Ag-Ba1-xKxFe2As2 Tapes

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

  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 Invited

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

    15th European Conference on Applied Superconductivity (EUCAS 2021)

  12. Critical current density anisotropy and scaling of Ag/(Ba, K)Fe2As2 tapes

    JUNYI Luo, TATSUNORI Okada, SATOSHI Awaji, TAKUMI Suzuki, HE Huang, XIANPING Zhang, YANWEI Ma

  13. Critical current density anisotropy and scaling of Ag/(Ba, K)Fe2As2 tapes

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

  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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