تقرير
Absence of $E_{2g}$ nematic instability and dominant $A_{1g}$ response in the kagome metal CsV$_3$Sb$_5$
| العنوان: | Absence of $E_{2g}$ nematic instability and dominant $A_{1g}$ response in the kagome metal CsV$_3$Sb$_5$ |
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| المؤلفون: | 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 |
| المصدر: | Phys. Rev. X 14, 031015 (2024) |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | Ever since the discovery of the charge density wave (CDW) transition in the kagome metal CsV$_3$Sb$_5$, the nature of its symmetry breaking is under intense debate. While evidence suggests that the rotational symmetry is already broken at the CDW transition temperature ($T_{\rm CDW}$), an additional electronic nematic instability well below $T_{\rm CDW}$ has been reported based on the diverging elastoresistivity coefficient in the anisotropic channel ($m_{E_{2g}}$). Verifying the existence of a nematic transition below $T_{\rm CDW}$ 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 CsV$_3$Sb$_5$ using three different techniques probing both isotropic and anisotropic symmetry channels. Contrary to previous reports, we find the anisotropic elastoresistivity coefficient $m_{E_{2g}}$ is temperature-independent, except for a step jump at $T_{\rm CDW}$. 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 $m_{A_{1g}}$ increases below $T_{\rm CDW}$, reaching a peak value of 90 at $T^* = 20$ K. 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 $A_{1g}$ channel. Comment: 11 pages, 5 figures, to appear in Physical Review X |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevX.14.031015 |
| URL الوصول: | http://arxiv.org/abs/2309.14574 |
| رقم الأكسشن: | edsarx.2309.14574 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevX.14.031015 |
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