Elastoresistivity measurements in the kagome metal AV₃Sb₅ (A = K, Rb, Cs)

The kagome metal AV₃Sb₅ (A = K, Rb, Cs) family has recently attracted significant attention due to the discovery of unconventional charge density wave (CDW), anomalous Hall effect (AHE) in the absence of long-range magnetic order, and superconductivity at low temperatures [1, 2]. Furthermore, other exotic symmetry-breaking electronic states such as nematicity have been reported in CsV₃Sb₅, closely associated with the CDW order and superconducting pairing [3, 4]. However, these claims have been challenged in light of recent elastoresistivity and thermodynamic measurements conducted by us and other groups [5-7]. These measurements presented the absence of nematicity in the CDW state. Simultaneously, a strong diverging isotropic elastoresistivity coefficient (m_A1g) was observed upon cooling, which shows an interesting resemblance to the temperature dependence of the AHE in CsV₃Sb₅. Here, we examine the elastoresistivity coefficients in other family members of the AV₃Sb₅ compound to explore the intriguing behavior of m_A1g.



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