Superfluidity of Atomically Layered 4 He Films
نویسنده
چکیده
J. Nyéki,* R. Ray, B. Cowan, and J. Saunders Millikelvin Laboratory, Department of Physics, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom (Received 2 March 1998) The superfluidity of 4He films adsorbed on the atomically flat surface of graphite, preplated with HD to tune the surface binding potential, has been studied using a torsional oscillator. The superfluidity of a single uniform fluid layer of 4He 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. [S0031-9007(98)06517-X]
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تاریخ انتشار 1998