Session H12: Lattice and Magnetic Properties of Multiferroics

8:00 AM–11:00 AM, Tuesday, March 11, 2008
Morial Convention Center Room: 203

Chair: Andrei Sushkov, University of Maryland

Abstract ID: BAPS.2008.MAR.H12.7

Abstract: H12.00007 : Pressure Dependence of the Phonon Modes of Hexagonal-RMnO3

9:12 AM–9:24 AM

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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)

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.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.H12.7