Abstract
The V V scattering spectra in the a b plane were measured with various scattering angles. It is shown that the elastic stiffness constant C 66 shows clear dispersion near the transition temperature T tr just in the frequency region of GHz. A dynamic central peak (DCP) was observed in the spectra of quasitransverse acoustic phonon near q //[100] in the very vicinity of T tr . From the observed angular dependence of the linewidth of DCP it is revealed that this central peak scattering is caused by the piezoelectric interaction between the z -component of the polarization fluctuation and the x y shear component in the quasitransverse phonon.
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