Abstract
The effective thermal conductivity of superfluid mixtures of He3 in He4 with an initial concentration of 9.8% He3 is investigated in the temperature interval 70–500 mK. The results, together with previously available experimental data on the thermal conductivity, viscosity, and mass and spin diffusion, are analyzed in the framework of the kinetic theory of the phonon–impuriton system of superfluid mixtures. It is shown that the experimental results for all the kinetic coefficients can be described from a unified viewpoint if the corresponding impuriton–impuriton scattering times are used as adjustable parameters. The role of each relaxation process in the complex hierarchy of relaxation times is determined as a function of temperature and concentration. It is found that even in concentrated mixtures a substantial contribution to the establishment of equilibrium is made by three-phonon processes. The phonon–impuriton relaxation times are calculated by integrating over the phonon energy in the entire region where such processes are allowed.
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