Abstract
The self-diffusion constant in bcc solid3He is calculated in the temperature regime where an atom changes place with a neighboring vacancy more often than flip-flops are induced through the Pauli exchange interaction. The calculation is based on the method of moments and describes vacancies with a model of fictitious spinS=1. The scattering of phonons by vacancies impedes the quantum tunneling of vacancies: the quantitative discussion of this effect shows that its relation with the lifetime of vacancy waves is not simple.
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Landesman, A. Moment calculation of vacancy-induced spin diffusion in bcc solid3He. J Low Temp Phys 17, 365–374 (1974). https://doi.org/10.1007/BF00659080
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DOI: https://doi.org/10.1007/BF00659080