New paradigm of unconventional superconductivity in the newly discovered topological kagome metal CsV3Sb5

The newly discovered layered kagome materials (Cs, K, Rb)V3Sb5 provide a rich frontier to study an interplay between novel correlated and topological electronic states. Hints of unconventional superconductivity, nontrivial topology and presence of charge-density-wave order make these materials particularly interesting leading to a surge in recent research interests. The material of interest for this proposal is CsV3Sb5. It is a Z2 topological metal with TSS and shows charge-density-wave like an order at 90 K. More intriguingly, this material becomes superconducting at 2.5 K. Recent low-T thermal conductivity measurement indicates nodal pairing mechanism. TF-uSR measurements provide unambiguous signatures of nodal pairing symmetry from the low-temperature behaviour of the superfluid density.