| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|---|---|---|
| Page(s) | C6-430 - C6-432 | |
| DOI | https://doi.org/10.1051/jphyscol:19816126 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-430-C6-432
DOI: 10.1051/jphyscol:19816126
Department of Physics, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422, Japan.
J. Phys. Colloques 42 (1981) C6-430-C6-432
DOI: 10.1051/jphyscol:19816126
HYPER-RAMAN SCATTERING STUDY OF FERROELECTRIC PHASE TRANSITIONS IN SrTiO3 AND BaTiO3
K. Inoue et N. AsaiDepartment of Physics, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422, Japan.
Abstract
We have directly observed the "ferroelectric" Eu and A2u soft modes in SrTiO3 separately in a temperature range from 50 K to 4.5 K by the hyper-Raman scattering method. Variation of the respective mode frequencies with temperature is measured and is compared to that of the dielectric constant. Further, it is found that the intensity of hyper-Rayleigh scattering light drastically increases as the temperature is lowered till 4.5 K. As for BaTiO3, the hyper-Raman spectra in the cubic phase have been measured with special emphasis on the spectral profile of the seemingly overdamped mode. The present result, however, seems to contradict the existence of the soft mode.