Effects of dipolar forces on critical sound attenuation in uniaxial systems |
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Authors: | G Meissner R Pirc |
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Institution: | Theoretische Physik, Universität des Saarlandes, 6600 Saarbrücken, Germany |
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Abstract: | Critical sound attenuation in uniaxial dipolar systems is investigated above and below Tc by using the dynamic renormalization-group analysis for an elastically coupled Ising-type model at d = 4. We predict a logarithmic crossover of the divergence of sound damping as and derive a universal, crossover-independent ratio R = 12.984|lnt| between the relaxation and the fluctuation damping below Tc. The effects of elastic anisotropy on the phase transition are discussed. |
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