Abstract
Abstract Laser light scattering spectroscopy has provided an exceptionally powerful tool for the study of structural phase transitions. In ferroelectric crystals, the “ferroelectric soft mode” whose condensation at T C produces the spontaneous polarization PO can frequently be studied by Raman scattering. Furthermore, interactions between the soft mode and other lattice modes can also be studied by Raman or Brillouin scattering. In the piezoelectric ferroelectrics, for example, the interaction leads to a major anomaly in the acoustic modes which can be readily observed in the Brillouin spectrum. We will review the application of light scattering spectroscopy to studies of structural phase transitions with particular emphasis on mode interactions and the central peak, and also discuss briefly several proposed applications of these techniques to superconducting transitions.
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