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Superfluid Phase Transition of 3He-4He Mixture Films Adsorbed on Alumina Powder
Authors:Hyung Cho  Gary A Williams
Affiliation:(1) Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095, USA.;(2) Present address: Physics Dept., Univ. of Chicago, Chicago, IL, 60637
Abstract:The superfluid phase transition of 3 He- 4 He mixture films adsorbed on 500 Å alumina powder has been studied for mixture films whose superfluid thickness is less than a monolayer. The transitions are found to be controlled by the Kosterlitz-Thouless critical line, but a strong broadening of the transition is observed as the 3 He concentration is increased. Analyzing the broadening in terms of a KT vortex-pair theory modified for the the finite powder size yields a vortex core parameter which increases nearly linearly with added 3 He. Also observed in these measurements is a temperature-dependent and 3 He-dependent depletion of the superfluid density at low temperatures, which is thought to arise from the high-frequency ripplon/third sound excitations of the film.
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