Nuclear Magnetism of Normal 3He and 3He-4He Mixtures in Aerogel |
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| Authors: | D Candela N Kalechofsky |
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| Affiliation: | (1) Physics and Astronomy Department, University of Massachusetts, Amherst, MA 1003, USA;(2) Present address: Oxford Instruments America, Concord, MA 01742, USA |
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| Abstract: | We report NMR experiments at 8 T on
3
He and
3
He-
4
He mixtures filling the pores of 95% porous aerogel, for temperatures T  6 mK. Magnetization measurements of pure
3
He reveal a localized layer approximately one monolayer thick. The longitudinal relaxation includes a component logarithmic in time, which is apparently associated with a fraction of the localized
3
He atoms. When the localized
3
He is displaced by adding
4
He the logarithmic relaxation disappears and T
1
for the dominant exponential relaxation increases. Measurements of the spin diffusion coefficient with the aerogel filled with dilute solution in equilibrium with bulk phase-separated mixture provide an unambiguous determination of the spin mean free path, s = 58 nm |
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| Keywords: | |
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