Abstract
We have measured the viscosity, η, and the slip length, ζ, of normal and superfluid 3 He using a torsional oscillator with a thick sample space. We coated the oscillating surface with 2.5 layers of 4 He film to study how the 4 He thin film changes the scattering mechanism of 3 He quasiparticles at the cell wall at 5 bar and 21 bar. In the normal phase, the temperature dependence of the viscosity was changed a little by the 4 He film at 21 bar but no change was observed at 5 bar. The slip length was enhanced by 4 He coating at 5 bar. This enhancement indicates the increase of specularity of 3 He quasiparticles scattering at the oscillating surface. On the other hand, a reduction of the slip length was observed at 21 bar. In the superfluid phase, the temperature dependence of ζ supports the existence of Andreev reflection even with 4 He film on the surface at 5 bar and 21 bar.
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Matsubara, A., Kawasaki, K., Inaba, H. et al. Surface Effects of 4He Coating on the Viscosity and the Slip Length of Normal and Superfluid 3He. Journal of Low Temperature Physics 114, 349–370 (1999). https://doi.org/10.1023/A:1022532501861
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DOI: https://doi.org/10.1023/A:1022532501861