Abstract
The nuclear magnetic susceptibility of3He films adsorbed on graphite substrates was measured by means of pulsed NMR techniques at 10 and 20 MHz. Submonolayer, monolayer, and multilayer coverages were examined, as well as one monolayer of3He mixed with various amounts of4He. The temperature range of measurements extended from 0.35 to 4.2 K. For pure3He and for3He mixed with4He the nuclear magnetic susceptibility displays departures from Curie's law. The observed behavior in pure3He layers can be fitted to an ideal-Fermi-gas curve with an effective degeneracy temperature of 0.15 K. The nuclear magnetic susceptibility of3He–4He films is also found to fall below the values predicted by Curie's law as the temperature is lowered, but the results suggest that in this case the film is not uniform, possibly as a result of a phase separation in the film at low temperatures.
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