AV$_3$Sb$_5$ kagome superconductors: a review with transport measurements

TL;DR

This review discusses the transport properties of AV$_3$Sb$_5$ kagome superconductors, highlighting their complex phases like charge density waves, nematicity, and superconductivity, and emphasizing transport measurements' role in understanding these states.

Contribution

It provides a comprehensive overview of transport measurements in AV$_3$Sb$_5$ kagome metals, clarifying their complex intertwined phases and unresolved issues like TRS-breaking.

Findings

Transport measurements reveal signatures of symmetry-breaking phases.

Evidence of unconventional superconductivity in AV$_3$Sb$_5$.

Insights into the interplay between charge order and superconductivity.

Abstract

Kagome systems have garnered considerable attention due to the unique features of the sublattice structure and band topology. The recently discovered kagome metals AV$_3$Sb$_5$ (where A = K, Rb, Cs) host a rich array of symmetry-breaking phases, including exotic charge density waves (CDW), electronic nematicity, pair density waves (PDW) and superconductivity. Despite extensive experimental and theoretical investigations into the diverse phases, several key issues remain contentious, such as a solid clarification of the time-reversal symmetry breaking (TRS-breaking) in the CDW order and its implications for the nature of superconducting (SC) pairing symmetry. This review aims to shed light on the transport properties of these intertwined phases, emphasizing the pivotal role that transport measurements play in uncovering the non-trivial quantum states of matter.