| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-181 - C6-183 | |
| DOI | https://doi.org/10.1051/jphyscol:1981653 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-181-C6-183
DOI: 10.1051/jphyscol:1981653
1 University of California, Irvine, California 92717, U.S.A.
2 Department of Physics, University of Edinburgh
J. Phys. Colloques 42 (1981) C6-181-C6-183
DOI: 10.1051/jphyscol:1981653
LOW FREQUENCY LIGHT SCATTERING SPECTRA OF AgI
W. Sasaki1, Y. Sasaki1, S. Ushioda1 et W. Taylor1, 21 University of California, Irvine, California 92717, U.S.A.
2 Department of Physics, University of Edinburgh
Abstract
The Rayleigh-Brillouin spectra of α- and β-AgI have been measured with a Fabry-Perot interferometer in a back scattering geometry. The longitudinal acoustic phonon frequency in the β-phase gradually decreases with increasing temperature from 17.4 GHz at room temperature to 16 GHz just below the transition. At the transition temperature (145°C) the frequency of the LA-mode shifts suddenly to 13.5 GHz, and thereafter it remains independent of temperature. No peak corresponding to the TA phonon was observed. A broad peak was observed in the frequency region near 27 GHz where a conductivity anomaly was found by earlier infrared reflectivity measurements.