Central Peak in K(H_1−xD_x)₃(SeO₃)₂ Studied by Light Scattering

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Central peak accompanied with the Brillouin spectrum of the soft acoustic shear mode of K(H_1−xD_x)₃(SeO₃)₂ has been studied for various x. It was revealed that minorisotopes D are the origin of the depolarized (VH) central peak. If the shifts of the transition temperature T_tr(x) from −61.4°C of proper KTS are assumed to be linearly proportional to x, I_cp⁄I_B is proportional to x(T−T_tr(x))^β, (β≈−1), where I_cp and I_B are the intensity of a central peak and that of a Brillouin peak, respectively.