Brillouin Scattering Study in SnCl₂·2H₂O near the Isomorphous Phase Transition Temperature

Abstract

Angular dependence in the a^*c plane of Brillouin scattering spectra in SnCl₂·2H₂O has been studied over a temperature range through the isomorphous phase transition temperature T_c=−53.8°C. Temperature dependence of elastic stiffness constants c₁₁, c₁₃, c₁₅, c₃₃, c₃₅ and c₅₅ has been obtained. Anomalies of c₁₃ and c₃₃ have been found at T_c. A phenomenological discussion is presented in order to explain these anomalies in connection with the layered structure.