Abstract
Ultrasonic velocity and attenuation were measured on TSCC single crystals at 10 MHz. The longitudinal sound was propagated along the a , b and c axes. The velocity was measured by pulse-echo-overlap-method. The sound velocities along the a and c axis show a sharp drop at T c , whereas the attenuation coefficients a sharp peak (width of less than 0.1 K) at the same temperature. These anomalies can be analyzed by Landau-Khalatonikov process. The longitudinal sound propagated along the ferroelectric b axis also shows anomalies in velocity and attenuation. However the width of the peak of the attenuation is about 1.3 K and is much wider than those of perpendicular ones. The anomalies in this direction were interpreted in terms of the peculiar nature of this ferroelectric where the short range interaction is playing important role for the phase transition.
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