THERMAL-CONDUCTIVITY OF DIELECTRIC CRYSTALS IN MILLIDEGREE REGIME
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In the millidegree regime, where thermal phonon wavelengths can greatly exceed the characteristic scale of surface roughness, thermal phonon scattering off boundaries will be nearly specular. Because of the enhanced phonon mean free path, the thermal conductivity is significantly increased. The amount of this increase depends greatly on the nature of the surface roughness. 1975.