Brillouin Scattering Study of the Phase Transition of Benzil
The Brillouin scattering technique is used for the first time to study the phase transition at 84 K of Benzil crystals. All the elastic constants have been determined vs temperature in the paraelastic phase. The velocities of the longitudinal and transverse acoustic waves have been deduced as a function of the wave vector in the principal planes. The transverse mode of lowest energy which propagates along the x axis is the soft acoustic mode related to the same order parameter as the Brillouin-zone-center E soft optical mode.
KeywordsElastic Constant Physical Review Acoustic Mode Principal Plane Slowness Curve
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- 5.B.A. Auld, “Acoustic fields and waves in solids” (Wiley, New-York, 1973) Vol.I.Google Scholar
- 6.J. Sapriel, “Acoustooptics” (Wiley, 1979) p. 18.Google Scholar
- 7.S. Aubry and R. Pick, Journal de Physique (Paris) 32, 657 (1971). Google Scholar
- 11.A. Dvorkin and A. Fuchs, Journal of Chemical Physics, 67, 789 (1977).Google Scholar