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

• Published in: Chinese physics letters Vol. 39; no. 10; pp. 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: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.09.2022; Songshan Lake Materials Laboratory,Dongguan 523808,China%State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China; Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621908,China%Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621908,China; Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China; Songshan Lake Materials Laboratory,Dongguan 523808,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
• 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.