Abstract
Recently ultrasonic measurements of the RbH 3(SeO 3) 2 crystal have shown that a transverse acoustic wave propagating along the modulation axis of the incommensurate structure ( c-axis) and polarized along the polar axis ( b-axis) exhibits greater temperature anomalies of its velocity and damping than a wave propagating along the b-axis and polarized along the c-axis. The possible explanation of this experimental result is given on the basis of the Landau theory.
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