Fizika Nizkikh Temperatur: Volume 48, Number 8 (August 2022), p. 661-667    ( to contents , go back )

Kinetic properties of solid 3He–4He mixtures in the model of freely moving impuritons

N. O. Gerashchenko, E. K. Nemchenko, K. E. Nemchenko, and T. G. Vikhtinskaya

V. N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
E-mail: nemchenko@karazin.ua
pos Анотація:719

Received January 14, 2022, published online June 20, 2022

Abstract

Within the framework of the gas-kinetic model of a mixture of weakly interacting gas of quasiparticles — phonons and impurities — the dissipative properties of 3He–4He solid solutions are considered: diffusion, self-diffusion, and thermal conductivity in the range of concentrations and temperatures, where impurities of 3He can be considered as quasiparticles freely moving through the crystal. Explicit expressions are obtained for the dissipative coefficients of spin and mass diffusion and the coefficient of thermal conductivity. The observed in experiments on spin relaxation, heat transfer, and separation of solutions dependencies and parameters of quasiparticles are discussed.

Key words: quantum diffusion, quantum crystals, solid solutions 3He–4He, impurities, phonons, diffusion, self-diffusion, thermal conductivity.

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