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arXiv · 2204.11166

In-plane anisotropic response to the uniaxial pressure in the hidden order state of URu$_2$Si$_2$

Xingyu Wang·Dongliang Gong·Bo Liu·Xiaoyan Ma·Jinyu Zhao·Pengyu Wang·Yutao Sheng·Jing Guo·Liling Sun·Wen Zhang·Xinchun Lai·Shiyong Tan·Yi-feng Yang·Shiliang Li
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Abstract

We studied the uniaxial-pressure dependence of the resistivity for URu$_{2-x}$Fe$_x$Si$_2$ samples with $x$ = 0 and 0.2, which host a hidden order (HO) and a large-moment antiferromagnetic (LMAFM) phase, respectively. For both samples, the elastoresistivity $\zeta$ shows a seemingly divergent behavior above the transition temperature $T_0$ and a quick decrease below it. We found that the temperature dependence of $\zeta$ for both samples can be well described by assuming the uniaxial pressure effect on the gap or certain energy scale except for $\zeta_{(110)}$ of the $x$ = 0 sample, which exhibits a non-zero residual value at 0 K. We show that this provides a qualitative difference between the HO and LMAFM phases. Our results suggest that there is an in-plane anisotropic response to the uniaxial pressure that only exists in the hidden order state without necessarily breaking the rotational lattice symmetry.

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Xingyu Wang, Dongliang Gong, Bo Liu, Xiaoyan Ma, Jinyu Zhao, Pengyu Wang, Yutao Sheng, Jing Guo, Liling Sun, Wen Zhang, Xinchun Lai, Shiyong Tan, Yi-feng Yang, Shiliang Li. 2022-04-24. In-plane anisotropic response to the uniaxial pressure in the hidden order state of URu$_2$Si$_2$. https://doi.org/10.1088/0256-307x%2F39%2F10%2F107101

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