The Raman study of the structural transition in metallic LiOsO<sub>3</sub> single crystal under high pressure up to 40 GPa

Junjie Gao; Suyu Fu; Jung-Fu Lin; Kazunari Yamaura; Jianshi Zhou

The Raman study of the structural transition in metallic LiOsO<sub>3</sub> single crystal under high pressure up to 40 GPa

ORAL

Abstract

LiOsO₃ is a novel metal that undergoes a second order phase transition from a centrosymetric R-3c structure to a polar R3c structure at T_s=140 K [1]. In this work, we report the measurements of Raman scattering including polarized and unpolarized models on LiOsO₃ single crystal at different pressure up to 40 GPa with a diamond anvil cell. There are four phonon peaks in the phase at ambient condition; new peaks emerge for P > 8.5 GPa. The feature of the high-pressure phase resembles that of LiOsO₃ below T_s at ambient condition [2]. The polar phase appears to be stabilized under high pressure, which is consistent with the observation of dT_s/dP >0 from the resistivity measurement [3]. Results from the symmetry analysis and first-principles calculations will also be presented.

March 6, 2020, 3:15 PM – March 6, 2020, 3:27 PM

Presenters

Jianshi Zhou

Geological Sciences, University of Texas at Austin, Department of Mechanical Engineering, The University of Texas at Austin, Walker Department of Mechanical Engineering, University of Texas at Austin, Department of Mechanical Engineering, University of Texas at Austin, The University of Texas at Austin, University of Texas at Austin, University of Texas, Materials Science and Engineering program, Department of Mechanical Engineering, University of Texas at Austin

Authors

Junjie Gao

Geological Sciences, University of Texas at Austin
Suyu Fu

Geological Sciences, University of Texas at Austin
Jung-Fu Lin

Geological Sciences, University of Texas at Austin, Jackson School of Geosciences, The University of Texas at Austin
Kazunari Yamaura

Research Center for Functional Materials, National Institute for Materials Science
Jianshi Zhou

Geological Sciences, University of Texas at Austin, Department of Mechanical Engineering, The University of Texas at Austin, Walker Department of Mechanical Engineering, University of Texas at Austin, Department of Mechanical Engineering, University of Texas at Austin, The University of Texas at Austin, University of Texas at Austin, University of Texas, Materials Science and Engineering program, Department of Mechanical Engineering, University of Texas at Austin