Abstract
Using torsional oscillator method, dissipation and superfluid density in thin films with superfluid transition temperatures T c=0.3–0.9 K, placed in a porous glass with 10 μm pores are measured. Substrate velocity dependencies up to 2 cm/s have been studied. Torsional oscillator measurements are performed both in a constant drive amplitude mode and in free decay processes. Comparison of results obtained for flat films and films in a porous glass with 1 μm pores allows us to clarify the influence of 2D–3D nature of superfluidity of the films in 10 μm porous glass.
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