中国物理B ›› 2024, Vol. 33 ›› Issue (10): 107402-107402.doi: 10.1088/1674-1056/ad6423

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Magnetoresistance hysteresis in the superconducting state of kagome CsV3Sb5

Tian Le(乐天)1,2,†, Jinjin Liu(刘锦锦)3,4, Zhiwei Wang(王秩伟)3,4,5, and Xiao Lin(林效)1,2,‡   

  1. 1 Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310024, China;
    2 Key Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science and Research Center for Industries of the Future, Westlake University, Hangzhou 310030, China;
    3 Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China;
    4 Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing 100081, China;
    5 Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314011, China
  • 收稿日期:2024-06-13 修回日期:2024-07-11 接受日期:2024-07-17 发布日期:2024-09-21
  • 通讯作者: Tian Le, Xiao Lin E-mail:letian@westlake.edu.cn;linxiao@westlake.edu.cn
  • 基金资助:
    Project supported by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang (Grant No. 2024SDXHDX0007), the National Natural Science Foundation of China (Grant No. 12474131), the China Postdoctoral Science Foundation (Grant Nos. 2022M722845 and 2023T160586), the Zhejiang Provincial Natural Science Foundation of China for Distinguished Young Scholars (Grant No. LR23A040001), the Research Center for Industries of the Future (RCIF) at Westlake University (Grant No. WU2023C009), the National Key R&D Program of China (Grant Nos. 2020YFA0308800 and 2022YFA1403400), and the Beijing Natural Science Foundation (Grant No. Z210006).

Magnetoresistance hysteresis in the superconducting state of kagome CsV3Sb5

Tian Le(乐天)1,2,†, Jinjin Liu(刘锦锦)3,4, Zhiwei Wang(王秩伟)3,4,5, and Xiao Lin(林效)1,2,‡   

  1. 1 Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310024, China;
    2 Key Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science and Research Center for Industries of the Future, Westlake University, Hangzhou 310030, China;
    3 Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China;
    4 Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing 100081, China;
    5 Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314011, China
  • Received:2024-06-13 Revised:2024-07-11 Accepted:2024-07-17 Published:2024-09-21
  • Contact: Tian Le, Xiao Lin E-mail:letian@westlake.edu.cn;linxiao@westlake.edu.cn
  • Supported by:
    Project supported by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang (Grant No. 2024SDXHDX0007), the National Natural Science Foundation of China (Grant No. 12474131), the China Postdoctoral Science Foundation (Grant Nos. 2022M722845 and 2023T160586), the Zhejiang Provincial Natural Science Foundation of China for Distinguished Young Scholars (Grant No. LR23A040001), the Research Center for Industries of the Future (RCIF) at Westlake University (Grant No. WU2023C009), the National Key R&D Program of China (Grant Nos. 2020YFA0308800 and 2022YFA1403400), and the Beijing Natural Science Foundation (Grant No. Z210006).

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摘要： The hysteresis of magnetoresistance observed in superconductors is of great interest due to its potential connection with unconventional superconductivity. In this study, we perform electrical transport measurements on kagome superconductor CsV$_3$Sb$_5$ nanoflakes and uncover unusual hysteretic behavior of magnetoresistance in the superconducting state. This hysteresis can be induced by applying either a large DC or AC current at temperatures ($T$) well below the superconducting transition temperature ($T_{\rm c}$). As $T$ approaches $T_{\rm c}$, similar weak hysteresis is also detected by applying a small current. Various scenarios are discussed, with particular focus on the effects of vortex pinning and the presence of time-reversal-symmtery-breaking superconducting domains. Our findings support the latter, hinting at chiral superconductivity in kagome superconductors.

关键词: hysteresis, magnetoresistance, kagome superconductor, chiral superconductor

Abstract: The hysteresis of magnetoresistance observed in superconductors is of great interest due to its potential connection with unconventional superconductivity. In this study, we perform electrical transport measurements on kagome superconductor CsV$_3$Sb$_5$ nanoflakes and uncover unusual hysteretic behavior of magnetoresistance in the superconducting state. This hysteresis can be induced by applying either a large DC or AC current at temperatures ($T$) well below the superconducting transition temperature ($T_{\rm c}$). As $T$ approaches $T_{\rm c}$, similar weak hysteresis is also detected by applying a small current. Various scenarios are discussed, with particular focus on the effects of vortex pinning and the presence of time-reversal-symmtery-breaking superconducting domains. Our findings support the latter, hinting at chiral superconductivity in kagome superconductors.

Key words: hysteresis, magnetoresistance, kagome superconductor, chiral superconductor

中图分类号:  (Superconducting films and low-dimensional structures)

  • 74.78.-w
74.25.F- (Transport properties) 85.25.-j (Superconducting devices) 74.25.-q (Properties of superconductors)