Abstract
We present measurements of the force-velocity response of a vibrating wire resonator in superfluid 3He-B at very low temperatures. At low velocities the response is dominated by intrinsic (vacuum) damping whilst at high velocities it is dominated by pair-breaking. At intermediate velocities there is a series of small plateaus where the velocity often shows small oscillations. We believe that the behaviour results from the stretching of vortices pinned to the wire. The vortices grow and self-reconnect, emitting a vortex ring. The behaviour is very sensitive to the presence of surrounding vortices generated by a neighbouring vibrating wire.
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Acknowledgements
We thank A. Stokes and M.G. Ward for their excellent technical support. This research is supported by the UK EPSRC and by the European FP7 Programme MICROKELVIN Project, No. 228464.
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Bradley, D.I., Fisher, S.N., Ganshin, A. et al. The Onset of Vortex Production by a Vibrating Wire in Superfluid 3He-B. J Low Temp Phys 171, 582–588 (2013). https://doi.org/10.1007/s10909-012-0690-8
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DOI: https://doi.org/10.1007/s10909-012-0690-8