Absence of𝐸2⁢𝑔Nematic Instability and Dominant𝐴1⁢𝑔Response in the Kagome MetalCsV3⁢Sb5,Physical Review X

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Absence of𝐸2⁢𝑔Nematic Instability and Dominant𝐴1⁢𝑔Response in the Kagome MetalCsV3⁢Sb5
Physical Review X ( IF 11.6 ) Pub Date : 2024-07-29 , DOI: 10.1103/physrevx.14.031015
Zhaoyu Liu ₁ , Yue Shi ₁ , Qianni Jiang ₁ , Elliott W. Rosenberg ₁ , Jonathan M. DeStefano ₁ , Jinjin Liu _{2,

2} , Chaowei Hu ₁ , Yuzhou Zhao _{1,

1} , Zhiwei Wang _{2,

2} , Yugui Yao _{2,

2} , David Graf _{3,

4} , Pengcheng Dai ₅ , Jihui Yang ₁ , Xiaodong Xu _{1,

1} , Jiun-Haw Chu ₁

Affiliation

Ever since the discovery of the charge density wave (CDW) transition in the kagome metal

C s V 3 S b 5

, the nature of its symmetry breaking has been under intense debate. While evidence suggests that the rotational symmetry is already broken at the CDW transition temperature (

𝑇 C D W

), an additional electronic nematic instability well below

𝑇 C D W

has been reported based on the diverging elastoresistivity coefficient in the anisotropic channel (

𝑚 𝐸 2 𝑔

). Verifying the existence of a nematic transition below

𝑇 C D W

is not only critical for establishing the correct description of the CDW order parameter, but also important for understanding low-temperature superconductivity. Here, we report elastoresistivity measurements of

C s V 3 S b 5

using three different techniques probing both isotropic and anisotropic symmetry channels. Contrary to previous reports, we find the anisotropic elastoresistivity coefficient

𝑚 𝐸 2 𝑔

is temperature independent, except for a step jump at

𝑇 C D W

. The absence of nematic fluctuations is further substantiated by measurements of the elastocaloric effect, which show no enhancement associated with nematic susceptibility. On the other hand, the symmetric elastoresistivity coefficient