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Abstract
The influence of normal (N) processes of phonon-phonon interactions on the temperature dependence of the effective free path length l eff of phonons in diamond was considered in the limits of Callaway's theory. It was shown that in perfect crystals at low temperatures N processes prevail over all other types of scattering and that even in the range of room temperature they play a significant role. In connection with this the possibility of second sound spreading in diamond was considered together with the specific influence of crystal boundaries on l eff. It was shown that in diamond with a reduced content of 13C isotope it is possible to reveal a state corresponding both to the Knudsen minimum and to phonon flow close to the Poiseuille one.
Published Version
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