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 Ts=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 Ts at ambient condition [2]. The polar phase appears to be stabilized under high pressure, which is consistent with the observation of dTs/dP >0 from the resistivity measurement [3]. Results from the symmetry analysis and first-principles calculations will also be presented.

*This work was supported by NSF, DMR 1905598.

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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