Phonon–Phonon Interaction in Gadolinium–Gallium Garnet Crystals

Abstract

Abstract Propagation velocity and temperature dependence of the sound wave attentuation coefficient in gadolinium–gallium garnet crystals are measured. The measurements are carried out in the frequency range 0.4 to 2.0 GHz and temperature range 77 to 293 K. On the basis of the measurements Debye temperature, specific heat of crystal as a function of temperature, and the temperature dependence of thermal phonon lifetime are determined. For calculation it is assumed that the examined material is isotropic.