Abstract
Abstract The results of a consistent perturbation theory of the non mean-field contributions to the ultrasonic attenuation anomalies are presented. The cases of one-and two-components order parameter (including incommensurate systems)are discussed. The main conclusions are : i) the fluctuation conmbunon in the non-symmetrical phase includes terms which were overlooked before. ii) the phason contribution to the longitudinal sound attenuation near incommensurate phase transition, is small in the low frequency limit.
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