Frictional Effects in Thin 3He Films |
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Authors: | R M Bowley Keith A Benedict |
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Affiliation: | (1) School of Physics and Astronomy, Nottingham University, Nottingham, UK |
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Abstract: | The recent high-precision torsional oscillator experiments of Casey et al. involving thin films of normal liquid 3He showed that the film decouples from the substrate with a time constant
which is proportional to T
−1 where T is the absolute temperature. We interpret this experiment by adapting a theory due to Meyerovich which was developed for dilute 3He-4He mixtures flowing between two relatively smooth plates. The analysis of the experiment confirms the central idea that
varies as T
−1. The variation of
with film thickness, d, is affected by the change in the shape of the free surface of the film, due to van der Waals forces, as the film becomes thinner. |
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Keywords: | thin-films surface-roughness noraml 3He torsional oscillator |
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