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The effect of long-range correlated quenched structural defects on thecritical ultrasound attenuation and sound velocity dispersion is studied forthree-dimensional Ising-like systems. A field-theoretical description of thedynamic critical effects of ultrasound propagation in solids is performed withallowance for both fluctuation and relaxation attenuation mechanisms. Thetemperature and frequency dependences of the dynamical scaling functions of theultrasound critical characteristics are calculated in a two-loop approximationfor different values of the correlation parameter $a$ of the Weinrib-Halperinmodel with long-range correlated defects. The asymptotic behavior of thedynamical scaling functions in hydrodynamic and critical regions is separated.The influence of long-range correlated disorder on the asymptotic behavior ofthe critical ultrasonic anomalies is discussed.

The influence of long-range correlated defects on critical ultrasound propagation in solids