Browsing by Author "Zhao, Yuzhou"

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    Absence of ${E}_{2g}$ Nematic Instability and Dominant ${A}_{1g}$ Response in the Kagome Metal ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$
    (American Physical Society, 2024) Liu, Zhaoyu; Shi, Yue; Jiang, Qianni; Rosenberg, Elliott W.; DeStefano, Jonathan M.; Liu, Jinjin; Hu, Chaowei; Zhao, Yuzhou; Wang, Zhiwei; Yao, Yugui; Graf, David; Dai, Pengcheng; Yang, Jihui; Xu, Xiaodong; Chu, Jiun-Haw
    Ever since the discovery of the charge density wave (CDW) transition in the kagome metal CsV3โขSb5, 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 (๐‘‡CDW), an additional electronic nematic instability well below ๐‘‡CDW has been reported based on the diverging elastoresistivity coefficient in the anisotropic channel (๐‘š๐ธ2โข๐‘”). Verifying the existence of a nematic transition below ๐‘‡CDW 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 CsV3โขSb5 using three different techniques probing both isotropic and anisotropic symmetry channels. Contrary to previous reports, we find the anisotropic elastoresistivity coefficient ๐‘š๐ธ2โข๐‘” is temperature independent, except for a step jump at ๐‘‡CDW. 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 ๐‘š๐ด1โข๐‘” increases below ๐‘‡CDW, reaching a peak value of 90 at ๐‘‡*=20 K. Our results strongly indicate that the phase transition at ๐‘‡* is not nematic in nature and the previously reported diverging elastoresistivity is due to the contamination from the ๐ด1โข๐‘” channel.