Pressure Dependence of the Phonon Modes of Hexagonal-RMnO3

ORAL

Abstract

We present high pressure IR measurements of the phonon spectra of HoMnO3 and YMnO3. Measurements were conducted over the pressure range ambient to $\sim $20 GPa. No phase changes were observed over this broad range of hydrostatic pressures. A strong non-linear variation of frequency with pressure is observed suggesting saturation at higher pressures. A discussion of the effect of hydrostatic pressure on the ferroelectric properties of these systems will be given based on comparisons with density functional calculations.

*This work is supported by DOE Grant DE-FG02-07ER46402.

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Authors

  • Peng Gao

    • Physics Department, New Jersey Institute of Technology

  • Trevor A. Tyson

    • Physics Department, New Jersey Institute of Technology

  • Zhenxian Liu

    • Geophysical Laboratory,Carnegie Institution of Washington

  • Sung Baek Kim

    • Dept. of Physics and Astronomy,Rutgers University

  • Sang-Wook Cheong

    • Dept. of Physics and Astronomy,Rutgers University