Peculiarities of the concentrated phase during decomposition of dilute 3He–4He solid solutions

The decomposition of 3He−4He solid solutions is studied by using pulse NMR method in 0.54% 3He (V = 20.55 cm3/mol) and 0.60% 4He (V = 24.04−24.93 cm3/mol) samples. At T = 100 mK, the decomposition in dilute solutions continues for over 30 h, the rate and temperature of decomposition depending on the past history of the sample. In the concentrated phase of the decomposed solution, the spin diffusion of 3He is quasi-one-dimensional with a diffusion coefficient D ≈ 10−5 cm2/s, which is characteristic of liquid 3He, and exceeds the diffusion coefficient in bulk solid 3He by two orders of magnitude. The longitudinal relaxation time in the quasi-one-dimensional phase (≈ 1 s) is of solid-state type and coincides with the results for bulk 3He. The temperature dependence of magnetization in quasi-one-dimensional phase is satisfactorily explained by the Curie law.

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