Brillouin Scattering Study of Incommensurate Crystals

  • Toshirou Yagi
Part of the NATO ASI Series book series (NSSB, volume 166)


A sound velocity dispersion in the incommensurate phase of NaNO2 appears in the propagation of the longitudinal sound wave along the [010] direction contrary to the other two directions [100] and [001], where no dispersion appears. Brillouin scattering study shows a negative result on the asymmetric propagation of the transverse wave in the incommensurate phase of NaNO2. The lower incommensurate phase of Ba2NaNb5O15 has similar relaxational mechanisms to those in the upper incommensurate phase.


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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Toshirou Yagi
    • 1
  1. 1.Department of PhysicsKyushu University 33Fukuoka 812Japan

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