Turbulent Vortex Flow Responses at the AB Interface in Rotating Superfluid 3He-B

Details Turbulent Vortex Flow Responses at the AB Interface in Rotating Superfluid 3He-B Turbulent Vortex Flow Responses at the AB Interface in Rotating Superfluid 3He-B

2011-08-22

arxiv.org/abs/1108.4283v1

Physical Review B, 84, 184532/1-7 (2011)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 6 figures

Scientific paper

10.1103/PhysRevB.84.184532

In a rotating two-phase sample of 3He-B and magnetic-field stabilized 3He-A the large difference in mutual friction dissipation at 0.20 Tc gives rise to unusual vortex flow responses. We use noninvasive NMR techniques to monitor spin down and spin up of the B-phase superfluid component to a sudden change in the rotation velocity. Compared to measurements at low field with no A-phase, where these responses are laminar in cylindrically symmetric flow, spin down with vortices extending across the AB interface is found to be faster, indicating enhanced dissipation from turbulence. Spin up in turn is slower, owing to rapid annihilation of remanent vortices before the rotation increase. As confirmed by both our NMR signal analysis and vortex filament calculations, these observations are explained by the additional force acting on the B-phase vortex ends at the AB interface.

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