Abstract
We present preliminary measurements of the intrinsic critical velocity for vortex production due to flow through a submicron aperture at temperatures from 1.65K toT λ−T=3×10−3 K and fluid drive pressures (Josephson frequencies) from 0.5mPa (f j=35Hz) to 250mPa (f j=17kHz). The critical velocity is probed using a constant pressure drive technique which maintains a constant phase slip nucleation rate for several minutes. The measured critical velocity qualitatively agrees with a model of thermally activated vortex half rings.
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Supported by the National Science Foundation and the Office of Naval Research
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Backhaus, S., Bruckner, N., Loshak, A. et al. The intrinsic critical velocity nearT λ . Czech J Phys 46 (Suppl 1), 127–128 (1996). https://doi.org/10.1007/BF02569479
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DOI: https://doi.org/10.1007/BF02569479