Viscosity measurement of superfluid He-3 in high magnetic field

Viscosity of superfluid He-3 was measured in the A and the A(1) phase in the magnetic field from 0.6 to 12 Tesla in the pressure between 0.5 and 29 bar. This measurement was done in a well controlled texture by use of a torsional oscillator with a defined sample geometry and a direction of the magnetic field, leading into quantitative results. Measured viscosity tensor, eta(44), shows a rapid decrease at both superfluid transitions, A(1) and A(2). Above a certain magnetic field, the viscosity has a minimum in the A(1) phase as a function of temperature, which was previously reported qualitatively in vibrating wire measurements. In the A phase, it decreases monotonously and seems to vanish toward zero Kelvin.