Abstract
Ac measurements of the critical velocity behavior of superfluid4He flow through a 2×2 μm square aperture in a 0.1 μm thick titanium foil have been made at temperatures between 0.36 and 2.10 K at frequencies which vary with temperature from 19 to 11 Hz. Single 2π phase slips are clearly resolved over the entire temperature range. These slips define a critical velocity that decreases nearly linearly with increasing temperature. Whereas below 1.0 K the width of the observed critical velocity distribution is relatively temperature independent, above 1.0 K it decreases linearly with temperature toward zero near Tλ. We also observe a smaller, less temperature-dependent, transient critical velocity induced by high drive levels.
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This work was supported by NSF grants DMR 90-02890 and 94-03522.
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Lindensmith, C.A., Flaten, J.A. & Zimmermann, W. Critical velocities and phase slips in superfluid4He flow through a 2×2 μm aperture. Czech J Phys 46 (Suppl 1), 131–132 (1996). https://doi.org/10.1007/BF02569481
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DOI: https://doi.org/10.1007/BF02569481