Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV₃Sb₅.

ABSTRACT: The recently discovered kagome superconductors AV₃Sb₅ (A = K, Rb, Cs) exhibit unusual charge-density-wave (CDW) orders with time-reversal and rotational symmetry breaking. One of the most crucial unresolved issues is identifying the symmetry of the superconductivity that develops inside the CDW phase. Theory predicts a variety of unconventional superconducting symmetries with sign-changing and chiral order parameters. Experimentally, however, superconducting phase information in AV₃Sb₅ is still lacking. Here we report the impurity effects in CsV₃Sb₅ using electron irradiation as a phase-sensitive probe of superconductivity. Our magnetic penetration depth measurements reveal that with increasing impurities, an anisotropic ful

SUBMITTER: Roppongi M 

PROVIDER: S-EPMC9905511 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature