Abstract

The change of elastic constants and mechanical loss from [100] elastic dipoles are calculated on the basis of a six level tunneling model. Resonance and relaxation mechanisms are treated together, and expressions for C'- and C 11 - sound modes are given. The results are used to analyse experimental data for the Rbcl:OH system. The low temperature ultrasonic attenuation is attributed to the resonance mechanism, and the frequency and the concentration dependence are interpreted in terms of dynamical and static interaction between dipoles.

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