卡戈米金属 CsV3Sb5 中不存在 E2g 向列不稳定性和占主导地位的 A1g 响应

IF 11.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical Review X Pub Date : 2024-07-29 DOI:10.1103/physrevx.14.031015
Zhaoyu Liu, Yue Shi, Qianni Jiang, Elliott W. Rosenberg, Jonathan M. DeStefano, Jinjin Liu, Chaowei Hu, Yuzhou Zhao, Zhiwei Wang, Yugui Yao, David Graf, Pengcheng Dai, Jihui Yang, Xiaodong Xu, Jiun-Haw Chu
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引用次数: 0

摘要

自从在卡戈米金属 CsV3Sb5 中发现电荷密度波(CDW)转变以来,关于其对称性破缺的性质一直存在激烈的争论。虽然有证据表明旋转对称性在 CDW 转变温度(TCDW)下已经被打破,但根据各向异性通道中发散的弹性系数(mE2g),在 TCDW 以下还有一种额外的电子向列不稳定性。验证是否存在低于 TCDW 的向列转变不仅对建立 CDW 有序参数的正确描述至关重要,而且对理解低温超导性也很重要。在此,我们报告了使用三种不同技术探测各向同性和各向异性对称通道的 CsV3Sb5 的弹性电阻率测量结果。与之前的报告相反,我们发现各向异性弹性系数 mE2g 与温度无关,只是在 TCDW 时出现阶跃。对弹性热效应的测量进一步证实了不存在向列波动,测量结果表明没有与向列电感相关的增强。另一方面,对称弹性系数 mA1g 在低于 TCDW 时增大,在 T*=20 K 时达到 90 的峰值。我们的结果有力地表明,T* 时的相变本质上不是向列的,之前报告的弹性系数发散是由于来自 A1g 通道的污染。
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Absence of E2g Nematic Instability and Dominant A1g Response in the Kagome Metal CsV3Sb5
Ever since the discovery of the charge density wave (CDW) transition in the kagome metal CsV3Sb5, 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 (TCDW), an additional electronic nematic instability well below TCDW has been reported based on the diverging elastoresistivity coefficient in the anisotropic channel (mE2g). Verifying the existence of a nematic transition below TCDW 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 CsV3Sb5 using three different techniques probing both isotropic and anisotropic symmetry channels. Contrary to previous reports, we find the anisotropic elastoresistivity coefficient mE2g is temperature independent, except for a step jump at TCDW. 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 mA1g increases below TCDW, reaching a peak value of 90 at T*=20K. Our results strongly indicate that the phase transition at T* is not nematic in nature and the previously reported diverging elastoresistivity is due to the contamination from the A1g channel.
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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