Superconductivity in the Z2 kagome metal KV3Sb5

Here we report the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV3Sb5. Magnetic susceptibility, resistivity, and heat capacity measurements reveal superconductivity below T-c = 0.93 K, and density functional theory (DFT) calculations further characterize the normal state as a Z(2) topological metal. Our results demonstrate that the recent observation of superconductivity within the related kagome metal CsV3Sb5 is likely a common feature across the AV(3)Sb(5) (A: K, Rb, Cs) family of compounds and establishes them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.

Automated summary

This study reports the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV3Sb5, with further characterization of the normal state as a Z(2) topological metal using density functional theory (DFT) calculations. The presence of superconductivity in the AV(3)Sb(5) (A: K, Rb, Cs) family of compounds suggests a common feature across these materials, establishing them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.