Superconducting diode effect and interference patterns in kagome CsV3Sb5

Tian Le, Zhiming Pan, Zhuokai Xu, Jinjin Liu, Jialu Wang, Zhefeng Lou, Xiaohui Yang, Zhiwei Wang (), Yugui Yao, Congjun Wu () and Xiao Lin ()
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Tian Le: Westlake University
Zhiming Pan: Westlake University
Zhuokai Xu: Westlake University
Jinjin Liu: Beijing Institute of Technology
Jialu Wang: Westlake University
Zhefeng Lou: Westlake University
Xiaohui Yang: Westlake University
Zhiwei Wang: Beijing Institute of Technology
Yugui Yao: Beijing Institute of Technology
Congjun Wu: Westlake University
Xiao Lin: Westlake University

Nature, 2024, vol. 630, issue 8015, 64-69

Abstract: Abstract The interplay among frustrated lattice geometry, non-trivial band topology and correlation yields rich quantum states of matter in kagome systems1,2. A series of recent members in this family, AV3Sb5 (A = K, Rb or Cs), exhibit a cascade of symmetry-breaking transitions3, involving the 3Q chiral charge ordering4–8, electronic nematicity9,10, roton pair density wave11 and superconductivity12. 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.

Date: 2024
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DOI: 10.1038/s41586-024-07431-y

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