Research Papers in Physics and Astronomy
Title
Effect of uniaxial stress on the unstable A1 (TO) phonon in ferroelectric gadolinium molybdate
Date of this Version
November 1975
Abstract
The effect of uniaxial stress along [100] on the unstable A1 (TO) phonon, 47 cm-1 at room temperature, in ferroelectric (<159°C) gadolinium molybdate has been studied by Raman scattering at 138, 141, 146, and 155°C. An increase in peak frequency and narrowing of the line shape is observed with increasing stress. The data are analyzed by fitting to a Lorentzian line shape. The force-constant parameter is insensitive to both stress and temperature, whereas the damping constant decreases nonlinearly with stress, approaching an asymptotic value at high stress.
Comments
Published by American Physical Society. Phys. Rev. B 12, 3783 (1975). http://prb.aps.org. Copyright © 1975 American Physical Society. Permission to use.