The dynamics of vortex generation in superfluid 3He-B

Details The dynamics of vortex generation in superfluid 3He-B The dynamics of vortex generation in superfluid 3He-B

2007-08-22

arxiv.org/abs/0708.3003v2

J. Low Temp. Phys. 153, 197-227 (2008)

Physics

Condensed Matter

Statistical Mechanics

revised & extended version. Journal of Low Temperature Physics, accepted (2008)

Scientific paper

10.1007/s10909-008-9827-1

A profound change occurs in the stability of quantized vortices in externally applied flow of superfluid 3He-B at temperatures ~ 0.6 Tc, owing to the rapidly decreasing damping in vortex motion with decreasing temperature. At low damping an evolving vortex may become unstable and generate a new independent vortex loop. This single-vortex instability is the generic precursor to turbulence. We investigate the instability with non-invasive NMR measurements on a rotating cylindrical sample in the intermediate temperature regime (0.3 - 0.6) Tc. From comparisons with numerical calculations we interpret that the instability occurs at the container wall, when the vortex end moves along the wall in applied flow.

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