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VOLUME 27 (1978) | ISSUE 5 | PAGE 252
Nonlocal hydrodynamics of phonon gas in dielectrics
It is shown that the character of the hydrodynamic phenomena in dielectrics is substantially altered. If the dispersion of the transverse oscillations has certain properties leading to a sharp increase of the relaxation time of the longitudinal long-wave phonons (LLP). The results explain the experimentally observed temperature dependence of the thermal-conductivity and second-sound-damping coefficients.