Dispersion of the Acoustic Phonon and New Dynamic Central Peak of Piezoelectric DKDP in the Paraelectric Phase Studied by Light Scattering
1981 年 50 巻 6 号 p. 2006-2013
詳細
1981 年 50 巻 6 号 p. 2006-2013
The VV scattering spectra in the ab plane were measured with various scattering angles. It is shown that the elastic stiffness constant C66 shows clear dispersion near the transition temperature Ttr 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 Ttr. 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 xy shear component in the quasitransverse phonon.
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