The Interpretation of Phase-Slip and Critical-Velocity Data from the Flow of Superfluid 4He through a 2 μm by 2 μm Aperture

W. Zimmermann, C. A. Lindensmith, J. A. Flaten

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

An analysis has been made of phase-slip and critical-velocity data for both the ac and dc flow of superfluid 4He through a 2 μm by 2 μm aperture in a 0.1-μm-thick titanium foil between 0.86 and 2.10 K. Single-2π phase slips were resolvable over the entire range of temperature in the ac flow measurements, carried out between 10 and 20 Hz, making it possible to determine the width of the critical-velocity distribution throughout the temperature range from these measurements. These data have been interpreted in terms of the thermal nucleation of vortex half-rings at the walls of the aperture, involving a velocity- and temperature-dependent energy barrier. The barrier can be modeled with moderate success using an approach close to that of Avenel and Varoquaux and coworkers.

Original languageEnglish (US)
Pages (from-to)497-502
Number of pages6
JournalJournal of Low Temperature Physics
Volume110
Issue number1-2
StatePublished - 1998

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