Abstract
It is shown that long-wave longitudinal phonons considerably affect heat transfer in most of existing crystals in spite of symmetry degeneracy of transverse vibrational branches. This is because of close values of phase velocity of transverse phonon modes in these crystals. Such effects are most pronounced in phonon hydrodynamics and in the propagation of second sound. It is shown that the thermal conductivity of bulk samples is a nonmonotonic function of the parameter characterizing the difference between the velocities of transverse modes.
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