In-Plane Anisotropic Response to Uniaxial Pressure in the Hidden Order State of URu2Si2

• Published in: Chinese physics letters 2022-09, Vol.39 (10), p.34-38
• Main Authors: Wang, Xingyu, Gong, Dongliang, Liu, Bo, Ma, Xiaoyan, Zhao, Jinyu, Wang, Pengyu, Sheng, Yutao, Guo, Jing, Sun, Liling, Zhang, Wen, Lai, Xinchun, Tan, Shiyong, Yang, Yi-feng, Li, Shiliang
• Format: Article
• Language: English
• ISSN: 0256-307X
• DOI: 10.1088/0256-307X/39/10/107101

We investigate the uniaxial-pressure dependence of resistivity for URu2-xFexSi2 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 ζ shows a seemingly divergent behavior above the transition temperature To and a quick decrease below it.We find that the temperature dependence of ζ for both samples can be well described by assuming the uniaxial pressure effect on the gap or certain energy scale except for ζ(110)of the x=0 sample,which exhibits a nonzero 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.