Pulsed Nuclear Resonance Investigation of the Susceptibility and Magnetic Interaction in Degenerate 3He Films
Continuous-wave nuclear resonance measurements have been made recently of the susceptibility and spin—lattice relaxation times on film1,2 of pure 3He and 3He–4He mixtures in the temperature range between 1.5 and 0.4°K for various film thicknesses. In the region investigated the films either were classical, in the sense that their susceptibility followed a Curie law, or showed only small (up ~ 26%) Fermi degeneracy, depending on coverage and temperature. It was shown that the susceptibility was consistent with a statistical layer model in which the first two layers could be considered as magnetically independent of each other and of the rest of the film, and each layer region of the film exhibited the same susceptibility as that of bulk 3He at the same interatomic spacing. Such an interpretation is not necessarily unique, and it is expected to be an approximation. In the present report we show that there are large deviations from this model at lower temperatures down to 50 m°K, in such a direction as to indicate a lower Fermi temperature in the real film than in the model, or a larger ferromagnetically inclined exchange interaction.
KeywordsBulk Liquid Vycor Porous Glass Cerium Magnesium Nitrate Degeneracy Temperature Fermi Degeneracy
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