Raman scattering at structural phase transitions

Y. Yacoby*, R. A. Cowley, T. J. Hosea, D. J. Lockwood, W. Taylor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The Raman scattering of light from the ferroelectric fluctuations of the uniaxial ferroelectric lead germanate is analysed and found to be well described by models for which the self-energy has appreciable dispersion at frequencies comparable with the soft-mode linewidth. A model is developed to calculate the self-energy arising from phonon-density fluctuations of the modes belonging to the same branch. The model shows that this contribution to the self-energy of the soft mode is particularly large if the modes with which it is interacting are overdamped. In detail, however, the model suggests that close to T c there is an appreciable contribution to the Raman scattering from the interference terms between the one- and two-phonon scattering.

Original languageEnglish
Article number034
Pages (from-to)5065-5077
Number of pages13
JournalJournal of Physics C: Solid State Physics
Volume11
Issue number24
DOIs
StatePublished - 1978
Externally publishedYes

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