Abstract
Experiments on a torsional oscillator containing a slab of liquid3He of thickness 105 µm and diameter 8.38 mm are described. Normal phase experiments confirm the theory of the oscillator dynamics but an apparent descrase in the measured value of ηT 2 at lowT casts doubt on the existing slip theory. Measurements for the uniform texture for the A phase give values of ρ s⊥ and η44. The ρ s⊥ measurements suggest that the A-phase energy gap is enhanced by a factor 1.24 over the BCS value. Distortion of the uniform texture by a magnetic field perpendicular to the slab occurs at a threshold field slightly smaller than predicted. Measurements for fields at different angles to the slab enable accurate values to be deduced for the superfluid density anisotropy and two other viscosity coefficients. The remaining two viscosity coefficients are only poorly determined. Flow alignment of the orbital texture was achieved by increasing the oscillator amplitude. A different texture obtained on some occasions after warming from the B phase was investigated but is not understood.
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Hook, J.R., Faraj, E., Gould, S.G. et al. Texture and hydrodynamics of a thin slab of superfluid3He-A in a torsional oscillator. II. Experiment. J Low Temp Phys 74, 45–80 (1989). https://doi.org/10.1007/BF00681752
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DOI: https://doi.org/10.1007/BF00681752