Condensed Matter Physics, 2006, vol. 9, No. 2(46), p. 403-410, English

Title: Critical sound attenuation of three-dimensional Ising systems
  P.V.Prudnikov (Omsk State University, Omsk, 644077 Russia) ,
  V.V.Prudnikov (Omsk State University, Omsk, 644077 Russia)

The field-theoretic description of dynamic critical effects of the disorder on acoustic anomalies near the temperature of second-order phase transition is considered for three-dimensional Ising-like systems. The calculations of sound attenuation in high temperature phase for pure and diluted Ising-like systems near the critical point are presented. The dynamic scaling function for critical attenuation coefficient is calculated. The effect of the quenched disorder on asymptotic behaviour of the critical ultrasonic anomalies is discussed.

Key words: renormalization group, disordered systems, field-theoretic approach, ultrasonic attenuation
PACS: 64.60.Ak, 64.60.Fr, 64.60.Ht, 43.35.Cg

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