Abstract
In an earlier paper, starting from the phonon Boltzmann equation, expressions were derived which give velocityc 2 and damping of second sound in a Debye solid in terms of mean relaxation times for various scattering processes. Using those results, heat-pulse data showing second sound in NaF were analyzed. The experimental values ofc 2 (T) can only be reproduced if\(\bar \tau _N^{ - 1}\), the mean relaxation rate for normal phonon collisions, varies with temperature asT 3. The mean Umklapp collision time also shows some unexpected behavior.
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Beck, H. Relaxation-time analysis of second-sound data in NaF. Z Physik B 21, 209–215 (1975). https://doi.org/10.1007/BF01313298
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DOI: https://doi.org/10.1007/BF01313298