Abstract
A high precision torsional oscillator has been developed for the detection of two dimensional superfluidity in 3 He films of thickness comparable to the superfluid coherence length, 70 nm at T=0. The mass loading from such a film can be detected with a 0.1% resolution. Measurements on normal films show an unexpected de-coupling from the surface with decreasing temperature, below 60 mK . The frequency shift and dissipation data can be interpreted using a phenomenological interfacial friction model.
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