Pressure tuning of spin-phonon coupling in ZnCr$_{2}$Se$_{4}$ by Raman spectroscopy

POSTER

Abstract

Raman scattering measurements are performed to investigate the phonon spectra of ZnCr$_{2}$Se$_{4}$ single crystal as functions of pressure and temperature. We find that five characteristic phonon modes vary simultaneously by changing pressure and temperature. With decreasing temperature, the phonon modes show anomalous shifts at $T_{\mathrm{E}}$, corresponding to the temperature of negative thermal expansion of lattice. With the application of pressure, in addition to the enhancements of frequency of Raman modes, $T_{\mathrm{E}}$ shifts to higher temperature, indicative of strengthening of spin-phonon coupling.

Authors

  • Xuliang Chen

    • Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

  • Xiao-Jia Chen

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015
    • Carnegie Institution of Washington
    • Geophysical Laboratory, Carnegie Institution of Washington, Wanshington, DC 20015, USA
    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C. 20015, USA

  • Zhaorong Yang

    • Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

  • Yuping Sun

    • Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

  • Yuheng Zhang

    • High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China

  • Wenge Yang

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C. 20015, USA

  • Ho-kwang Mao

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C. 20015, USA