Abstract
When a magnetic field B prevents the orbital axis l from lining up with +- B (in the dipole-locking regime), persistent-current states in superfluid /sup 3/He-A are characterized by two quantum numbers n/sub w/ and n/sub t/. These states can decay via two new phase-transfer mechanisms by which n/sub w/ +- n/sub t/ changes by multiples of two, keeping n/sub w/minus-or-plusn/sub t/ constant. Intricate effects due to the presence of surfaces are analyzed. With modifications, the present analysis can also be applied to the zero-field case. Most useful conclusions are obtained in the helical-texture regime, and in a metastable situation with l locked in opposite directions on two parallel walls.
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