Abstract
The possibility of second sound wave propagation in isotopic pure ideal single crystals of orthodeuterium, parahydrogen, and neon is studied. The same collision frequencies as those used in Callaway’s model to describe experimental data on thermal conductivity are used to find the region of existence of second-sound waves, which lies in the region of the maximum value of the thermal conductivity. The concentrations of the isotopes H1, D2, and Ne22 below which weakly damped second sound waves can exist are determined. It is important to take account of phonon scattering by the boundaries of the sample.
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