Electronic Nematicity in URu2Si2 Revisited
Electronic Nematicity in URu2Si2 Revisited
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重新审视 URu2Si2 中的电子向列性
DOI：
10.1103/physrevlett.124.257601
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发表时间：
2020
影响因子：
8.6
通讯作者：
Christoph Meingast
中科院分区：
文献类型：
--
作者：
Liran Wang;Mingquan He;Frédéric Hardy;Dai Aoki;Kristin Willa;Jacques Flouquet;Christoph Meingast
隐序态的性质仍然是重费米子物理学中尚未解决的主要问题之一。最近，转矩磁强计、x射线衍射和弹性电阻率数据表明，HO相变是由电子向列效应驱动的。在这里，我们使用各向异性热膨胀、杨氏模量、弹性电阻率和比热测量来寻找这种所谓的结构不稳定性的热力学特征。与已发表的结果相反，我们在任何数据中都没有发现旋转对称性破缺的证据。有趣的是，我们的弹性电阻率测量结果与已发表的结果完全一致，显示出居里-魏斯散度，但我们将其归因于体积而不是对称破坏效应。最后，在我们的热容数据中观察到热波动的明确证据，我们从中估计HO相关长度。
The nature of the hidden-order (HO) state inremains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction, and elastoresistivity data have suggested that the HO phase transition atis driven by electronic nematic effects. Here, we search for thermodynamic signatures of this purported structural instability using anisotropic thermal expansion, Young’s modulus, elastoresistivity, and specific-heat measurements. In contrast to the published results, we find no evidence of a rotational symmetry breaking in any of our data. Interestingly, our elastoresistivity measurements, which are in full agreement with published results, exhibit a Curie-Weiss divergence, which we however attribute to a volume and not to a symmetry-breaking effect. Finally, clear evidence for thermal fluctuations is observed in our heat-capacity data, from which we estimate the HO correlation length.