Bulk evidence of anisotropic $s$-wave pairing with no sign change in the kagome superconductor CsV${}_3$Sb${}_5$

M. Roppongi, K. Ishihara, Y. Tanaka +12

The recently discovered kagome superconductors $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs) possess a unique band structure with van Hove singularities and Dirac dispersions, in which unusual…