Thermal conductivity of the binary gas of thermal excitations

Abstract

The thermal conductivity of binary gas of thermal excitation in presence of the external scattering centers has been investigated. The obtained results for coefficient of thermal conductivity is turned to be applicable for various mixtures of thermal excitations: phonon and rotons in HeII, phonons of different polarizations in solids, phonons and magnons in ferrodielectrics. These general results are shown to be valid at arbitrary relations between interaction rates of thermal excitations of different types and rates of quasiparticles scattering on external scattering centers. The limiting case of fast and slow equilibrium between thermal excitations of different types were considered. This fact allows to make the results available so far more accurate and determine the regions of those application.