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Abstract
Because the gap of superfluid 3He is anisotropic, any motion of the anisotropy axis will lead to a non-equilibrium quasiparticle distribution. Equilibrium can only be restored through quasiparticle collisions which lead to dissipation. This dissipation was measured using the damping of torsional oscillations of a powder-filled torus about its axis of symmetry. In both the A and B phases, the orbital viscosity coefficient, µ, extracted from the damping was proportional to (1-T/Tc) near Tc. At low temperatures µ, is independent of temperature. Both observations are in contrast with theoretical predictions. The dissipation is also sensitive to the presence of a d.c. supercurrent. This was used to study persistent currents in the A-phase, where the flow decayed in discrete jumps of approximately 5 circulation quanta.
Published Version
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