BRILLOUIN SCATTERING EXPERIMENTS IN THE FERROELECTRIC CRYSTAL TRIGLYCINE SULFATE
JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF PHYSICS
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Brillouin scattering measurements were made on triglycine sulfate near its Curie temperature TC. Temperature and field dependent single relaxation time acoustic velocity dispersion was found in confirmation of the predictions of a simple free energy expansion theory of the dynamics of the strain and polarization fluctuations near TC. Additional experimental results obtained for triglycine sulfate include measurement of the acoustic mode velocities for all three modes for various directions in the 010 plane, measurement of the longitudinal velocity along the ferroelectric axis, a measurement of a reference absolute cross section for Brillouin scattering in triglycine sulfate, and determination of some of the Pockels coefficients from the Brillouin component intensity in various directions.
- Solid State Physics