1994 年 63 巻 12 号 p. 4282-4285
The elastic anomaly in the first-order α -β phase transition in K2ZnBr4 has been studied by Brillouin scattering repeated many times on heating run through the transition point 458, K (Tt). A discrete distribution of the Brillouin frequency shift of the longitudinal acoustic mode in the β phase was observed in contrast to its unique value in the α phase below Tt. On the other hand, the transverse mode shows negligibly small anomalous behavior near Tt. The result is well explained by the elastic properties calculated in terms of the virtual intermediate states model proposed recently as a mechanism of the first-order α -β phase transition.
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