Phys. Rev. B 76, 052505 (2007) [3 pages]Observation of an extrinsic critical velocity using matter wave interferometryReceived 5 July 2007; published 13 August 2007 We report an experiment that uses a superfluid helium quantum interference device to probe the initial onset of the motion of a single vortex line driven by axial flow in a macroscopic channel. When the superfluid velocity reaches a temperature independent critical value (vc∼1 mm∕s) periodic 2π phase slippage occurs with a frequency of the order of a few Hz. As the axial flow velocity increases, the frequency increases, possibly stepwise. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.052505
DOI:
10.1103/PhysRevB.76.052505
PACS:
67.40.Vs, 67.40.Hf, 67.40.Rp
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