Towards the grain boundary phonon scattering problem: an evidence for a low-temperature crossover
V. A. Osipov, S. E. Krasavin
Abstract
The problem of phonon scattering by grain boundaries is studied within the wedge disclination dipole (WDD) model. It is shown that a specific q-dependence of the phonon mean free path for biaxial WDD results in a low-temperature crossover of the thermal conductivity, κ. The obtained results allow to explain the experimentally observed deviation of κ from a T3 dependence below 0.1K in LiF and NaCl.
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