A central peak has been observed in the Brillouin spectra of a triglycine sulfate (TGS) crystal. The observed scattering intensity shows a strong anisotropy; for the case with a wave vector q parallel to the c axis (perpendicular to the polar axis) it shows a temperature dependence which resembles closely that of the specific heat C p in shape, while for the case of q parallel to the b axis (parallel to the polar axis) it is almost independent of temperature. These results are interpreted in terms of the depolarization field effect which causes an anisotropic fluctuations of the polarization. From the analysis of the temperature dependence curve observed in the case of q parallel to the c axis, it is concluded that the central peak is attributed to the thermal diffusion mode.
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Miyakawa et al. (1980) studied this question.
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