Study of the superfluid transition in two-dimensionalHe4films

Abstract
We have studied the superfluid transition of thin two-dimensional He4 films adsorbed on an oscillating substrate. The superfluid mass and dissipation support the Kosterlitz-Thouless picture of the phase transition in a two-dimensional superfluid. In addition we observe finitevelocity effects which are not explained by current dynamic theories. We also report data on two-dimensional He3-He4 mixtures.

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