Investigation of magnetic field induced textural changes in superfluid 3He–A and of the anisotropy of viscosity, superfluid density, and sound propagation

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Abstract
Textural changes induced by a magnetic field in dipole-locked superfluid 3He–A in a slab geometry have been observed and agree well with the theoretically predicted changes. In one set of observations, ultrasound transmission at 15.15 MHz across a slab 2 mm wide was used as the probe of the texture, and in another set of measurements the textural changes were inferred from the behaviour of a torsional oscillator containing a slab of thickness 105 μm. From the former set of observations, we deduced the anisotropy of the sound attenuation and velocity, and from the latter we calculated the anisotropy of the viscosity and the superfluid density. In both experiments the field, perpendicular to the slab, that caused instability of the uniform texture was smaller than that theoretically predicted. Observations on the A phase after warming from the B phase exhibited very different behaviour from those made after cooling from the normal phase.

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