Abstract
Results are reported for pulsed NMR studies of thick films (25 layers) of ${}^{3}\mathrm{He}$ physisorbed on carefully prepared hexagonal boron nitride substrates. Peculiar doublet structures in the NMR spin-echo shapes have been observed for temperatures $0.9l~Tl~1.2\mathrm{K}.$ These echo shapes are interpreted in terms of a two-component system: (a) a solid phase (up to 4.6 layers) near the substrate, and (b) a liquid phase near the free surface of the film.
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