Universal Features of the Superfluid Transition of Thin ⁴He Films on Mylar

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.116, Iss.5-6, 1999-09, pp. : 421-432

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Abstract

Data from a series of torsional oscillator experiments performed on ⁴He films on Mylar have been available for some time. However, up until now it was thought that disorder in the substrate leads to a wide variation in the results. Here the data is analysed in a new way which captures for the first time the universal features of the results. Comparisons are made with recent theoretical work which predicts universal behaviour in the superfluid film transition and with the results of similar experiments performed on a Grafoil substrate.

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