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Ferroelectricity; phase transition; ultrasonic attenuation and velocity change; soft mode; RbH₂PO₄

Ferroelectric phase transition in RbH₂PO₄ has been investigated using propagation of longitudinal acoustic waves along the polar axis near the transition temperature. The velocity of this mode is continuous across the transition temperature. Velocity data in the ferroelectric phase are analyzed in terms of coupled soft modeacoustic mode model of Pytte to obtain the temperature dependence of the soft mode frequency. The attenuation data in the ferroelectric phase show power law dependence. It follows scaling behaviour of the type predicted by Kawasaki from the mode-mode coupling theory and the dynamical scaling.

G P Singh¹ B K Basu¹

1. Tata Institute of Fundamental Research, Bombay - 400 005

Published

August 1978

Manuscript received

27 February 1978

Manuscript revised

19 May 1978