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Orbital viscosity in superfluid He-3-B in a magnetic field.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>02/2005
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number3-4
Number of pages6
Pages (from-to)771-776
<mark>Original language</mark>English


Orbital viscosity is usually associated with the A phase of superfluid He-3 which has a finite orbital angular momentum even in zero magnetic field. The B phase has no orbital angular momentum in zero magnetic field, but both spin and orbital angular momenta are induced by a field. The Leggett equations for spin dynamics assume that the orbital angular momentum can only change on timescales much longer than those involved in spin dynamics. We calculate the orbital viscosity of the B phase in both the hydrodynamic and ballistic limits. At low temperatures the orbital viscosity becomes vanishingly small which gives rise to the possibility of coupled spin-orbit dynamics.