Dynamic Remanent Vortices in Superfluid 3He-B

Details Dynamic Remanent Vortices in Superfluid 3He-B Dynamic Remanent Vortices in Superfluid 3He-B

2006-07-13

arxiv.org/abs/cond-mat/0607323v2

J. Low Temp. Phys. 148, 311-316 (2007)

Physics

Condensed Matter

Superconductivity

Submitted to the proceedings of the Quantum Fluids and Solids Conference 2006 (to be published in Journal of Low Temperature P

Scientific paper

10.1007/s10909-007-9380-3

We investigate the decay of vortices in a rotating cylindrical sample of 3He-B, after rotation has been stopped. With decreasing temperature vortex annihilation slows down as the damping in vortex motion, the mutual friction dissipation \alpha(T), decreases almost exponentially. Remanent vortices then survive for increasingly long periods, while they move towards annihilation in zero applied flow. After a waiting period \Delta t at zero flow, rotation is reapplied and the remnants evolve to rectilinear vortices. By counting these lines, we measure at temperatures above the transition to turbulence ~0.6T_c the number of remnants as a function of \alpha(T) and \Delta t. At temperatures below the transition to turbulence T \lesssim 0.55 T_c, remnants expanding in applied flow become unstable and generate in a turbulent burst the equilibrium number of vortices. Here we measure the onset temperature T_on of turbulence as a function of \Delta t, applied flow velocity, and length of sample L.

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