Abstract
In this work, we study the influence of orbital viscosity on the evolution of the order-parameter and texture in the B phase of superfluid 3He near a moving boundary. From the redistribution of thermal quasiparticles within the texture, we develop a model which confers a substantial effective mass on the interface, and provides a new mechanism for friction as the boundary moves. We have tested the model against existing data for the motion of an A-B interface whose motion was controlled by a magnetic field. The model allows us to make predictions for the behaviour in experimental situations which involve texture rearrangement arising from motion of the B-phase boundary.
Highlights
Many systems[1,2,3,4,5,6,7] condense into coherent states characterised by a “rigidity” to distortions in their wave function description[8]
The motivation for the present work arises from the very high dissipation observed when an A-B interface in superfluid 3He is spatially oscillated at very low temperatures (T ∼ 0.16Tc), as reported previously[11]
There is a dissipative component which can be related to the orbital viscosity, as discussed by Fisher and Suramlishvili[13], and secondly, a reactive component which can be viewed as an effective mass, which we have discussed in an earlier paper[14] in which we reported a very preliminary attempt at introducing orbital dynamic ideas to explain the specific case of the behavior of a moving A-B interface
Summary
Many systems[1,2,3,4,5,6,7] condense into coherent states characterised by a “rigidity” to distortions in their wave function description[8]. In this work we study the effect of the change of the orbital direction at the boundaries of the B-phase in magnetic fields due to the movement of these boundaries.
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