Structural and electrical transport properties of charge density wave material LaAgSb2 under high pressure* *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

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 P C ∼ 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.