Abstract
A simple phenomenological theory is presented to discuss the origin of elastic “ central peaks ” observed near structural phase transition temperatures by light scattering. The scattering intensity I C of light from the polarization induced around a charge impurity is formulated on the analogy of the Huang scattering of X-rays. The dependence of I C on the direction of the scattering wave vector and temperature has been numerically computed and is found to reproduce well the experimental results in KD 2 PO 4 . The theory is shown to be applicable to the “ central peak ” due to the strain induced around an elastic defect observed in KH 2 PO 4 or KH 3(1- x ) D 3 x (SeO 3 ) 2 .
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