AV3Sb5 kagome superconductors

Abstract

The recent discovery of the AV3Sb5 (A = K, Rb, Cs) kagome superconductors launched a growing field of research investigating the interplay between superconductivity and charge-density wave order in kagome metals. Specifically, the AV3Sb5 family of materials naturally exhibits a Fermi level close to the Van Hove singularities associated with the saddle points formed from the prototypical kagome band structure. The charge-density wave and superconducting states that form within the kagome networks of these compounds exhibit a number of anomalous properties reminiscent of theoretical predictions of exotic states in kagome metals tuned close to their Van Hove fillings. In this Review, we discuss the key structural and electronic features of AV3Sb5 compounds and survey the status of investigations of their unconventional electronic phase transitions. The family of AV3Sb5 kagome superconductors provides a fascinating platform for the investigation of the interplay between superconductivity and charge-density wave order. This Review discusses the properties of the anomalous charge-density wave and superconducting states observed in these materials and surveys future directions in the study of these and related kagome metals.