1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China; 2 Science Island Branch, Graduate School of University of Science and Technology of China, Hefei 230026, China; 3 Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; 4 Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University), Ministry of Education, Hefei 230601, China; 5 Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 200031, China; 6 High Magnetic Field Laboratory of Anhui Province, Hefei 230031, China
Abstract Layered lanthanum silver antimonide LaAgSb2 exhibits both charge density wave (CDW) order and Dirac-cone-like band structure at ambient pressure. Here, we systematically investigate the pressure evolution of structural and electronic properties of LaAgSb2 single crystal. We show that the CDW order is destabilized under compression, as evidenced by the gradual suppression of magnetoresistance. At PC～ 22 GPa, synchrotron x-ray diffraction and Raman scattering measurements reveal a structural modification at room-temperature. Meanwhile, the sign change of the Hall coefficient is observed at 5 K. Our results demonstrate the tunability of CDW order in the pressurized LaAgSb2 single crystal, which can be helpful for its potential applications in the next-generation devices.
Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0305700, 2017YFA0403600, and 2016YFA0401804), the National Natural Science Foundation of China (Grant Nos. U1632275, U19A2093, U1932152, U1632162, 12004004, 11874362, 11804344, 11704387, and 11674325), the Natural Science Foundation of Anhui Province, China (Grant Nos. 1908085QA18, 2008085QA40, and 1808085MA06), the Users with Excellence Project of Hefei Science Center CAS (Grant Nos. 2018HSC-UE012, 2020HSC-CIP014, 2020HSC-UE015, and 2021HSC-UE008), and the Major Program of Development Foundation of Hefei Center for Physical Science and Technology (Grant No. 2018ZYFX002). A portion of this work was supported by the High Magnetic Field Laboratory of Anhui Province (Grant No. AHHM-FX-2020-02). Yonghui Zhou was supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2020443).
Corresponding Authors:
Chao An, Xiaoping Yang, Zhaorong Yang
E-mail: chaoan@ahu.edu.cn;xpyang@hmfl.ac.cn;zryang@issp.ac.cn
Cite this article:
Bowen Zhang(张博文), Chao An(安超), Xuliang Chen(陈绪亮), Ying Zhou(周颖), Yonghui Zhou(周永惠), Yifang Yuan(袁亦方), Chunhua Chen(陈春华), Lili Zhang(张丽丽), Xiaoping Yang(杨晓萍), and Zhaorong Yang(杨昭荣) Structural and electrical transport properties of charge density wave material LaAgSb2 under high pressure 2021 Chin. Phys. B 30 076201
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