Phonon scattering by static stress fields of circular wedge disclination loops was investigated in the framework of the deformation potential approach. Numerical calculations of the mean free path and thermal conductivity, κ, demonstrated that the temperature dependence of κ exhibited a minimum at a certain temperature T* in the low-temperature range. The thermal conductivity κ sharply increased as T–3 with a decrease in temperature (T < T*) and exhibited a dislocation behavior (κ ~ T2) with an increase in temperature (T > T*). The results obtained for the wedge disclination loop were compared with the available data for uniaxial disclination dipoles. It was shown that the properties of uniaxial disclination dipoles serving as sources of phonon scattering were similar to those of wedge disclination loops.

Specific Features of Low-Temperature Phonon Scattering in Materials with Tilted Disclination Loops. S.E.Krasavin, V.A.Osipov: Physics of the Solid State, 2002, 44[6], 1152-5