Superfluid Phase Transition of 3He-4He Mixture Films Adsorbed on Alumina Powder |
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Authors: | Hyung Cho Gary A Williams |
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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 |
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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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Keywords: | |
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