Nyeki, J , Ray, R , Cowan, B and Saunders, J (1998) Superfluidity of atomically layered He-4 films. Physical Review Letters, 81 (1).
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The superfluidity of He-4 films adsorbed on the atomically flat surface of graphite, preplated with KD to tune the surface binding potential, has been studied using a torsional oscillator. The superfluidity of a single uniform fluid layer of He-4 shows an intrinsic coverage dependent suppression, while the fluid bilayer is fully superfluid at T = 0. The contribution of nonvortex excitations in the film to the normal density shows a strong dependence on coverage, arising from the atomic layering of the film.
This is a Submitted version This version's date is: 6/7/1998 This item is not peer reviewed
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