Superconducting diode effect and interference patterns in kagome CsV3Sb5

• 成果类型: Article
• 署名作者: Le, Tian; Pan, Zhiming; Xu, Zhuokai; Liu, Jinjin; Wang, Jialu; Lou, Zhefeng; Yang, Xiaohui; Wang, Zhiwei; Yao, Yugui; Wu, Congjun; Lin, Xiao
• 署名单位: Westlake University; Westlake University; Westlake University; Westlake University; Beijing Institute of Technology; Beijing Institute of Technology; China Jiliang University; Beijing Institute of Technology; Westlake University
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5478
• DOI: 10.1038/s41586-024-07431-y
• 发表日期: 2024-06-06
• 关键词: time-reversal symmetry; charge order

摘要

The interplay among frustrated lattice geometry, non-trivial band topology and correlation yields rich quantum states of matter in kagome systems(1,2). A series of recent members in this family, AV(3)Sb(5) (A=K, Rb or Cs), exhibit a cascade of symmetry-breaking transitions(3), involving the 3Q chiral charge ordering(4-8), electronic nematicity(9,10), roton pair density wave(11) and superconductivity(12). The nature of the superconducting order is yet to be resolved. Here we report an indication of dynamic superconducting domains with boundary supercurrents in intrinsic CsV3Sb5 flakes. The magnetic field-free superconducting diode effect is observed with polarity modulated by thermal histories, suggesting that there are dynamic superconducting order domains in a spontaneous time-reversal symmetry-breaking background. Strikingly, the critical current exhibits double-slit superconductivity interference patterns when subjected to an external magnetic field. The characteristics of the patterns are modulated by thermal cycling. These phenomena are proposed as a consequence of periodically modulated supercurrents flowing along certain domain boundaries constrained by fluxoid quantization. Our results imply a time-reversal symmetry-breaking superconducting order, opening a potential for exploring exotic physics, for example, Majorana zero modes, in this intriguing topological kagome system.