Brillouin Scattering Study of the Phase Transition of Benzil

  • M. Boissier
  • R. Vacher
  • J. Sapriel


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.


Elastic Constant Physical Review Acoustic Mode Principal Plane Slowness Curve 
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • M. Boissier
    • 1
  • R. Vacher
    • 1
  • J. Sapriel
    • 2
  1. 1.Université des Sciences et Techniques du LanguedocMontpellierFrance
  2. 2.Centre National d’Etudes des TélécommunicationsBagneuxFrance

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