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Critical temperature and critical current of thin-film superfluid3He

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Abstract

Superfluid3He film flow over the rim of a copper beaker has been measured. The flow rate was measured as a function of temperature and as a function of depth of3He below the rim or film thickness at the rim. The critical current, calculated from the flow rate, varied as (1 −T/T p c )3/2 as expected for pair-breaking;T p c is a film-thickness-dependent critical temperature. However, the magnitude of the current was an order of magnitude smaller than expected for pair-breaking, in agreement with other experiments that have demonstrated a lower dissipation mechanism in superfluid3He. The suppression of the critical temperatureT p c /T b c , whereT b c =0.93 mK is the bulk3He transition temperature, varied from 0.93 to 0.7 as the film thickness at the rim varied from 120 to 90 nm. These ratios are larger than expected from Ginzburg-Landau or microscopic theory of superfluid3He-B.

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Authors and Affiliations

  1. Physics Department, Queen's University, Kingston, Ontario, Canada

    J. G. Daunt, J. P. Harrison, S. Steel & P. Zawadski

  2. Physics Department, RMC, Kingston, Ontario, Canada

    R. F. Harris-Lowe & R. R. Turkington

  3. Division of Physics, NRC, Ottawa, Canada

    A. Sachrajda

Authors
  1. J. G. Daunt
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  2. R. F. Harris-Lowe
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  3. J. P. Harrison
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  4. A. Sachrajda
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  5. S. Steel
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  6. R. R. Turkington
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  7. P. Zawadski
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Deceased 19 June 1987.

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Daunt, J.G., Harris-Lowe, R.F., Harrison, J.P. et al. Critical temperature and critical current of thin-film superfluid3He. J Low Temp Phys 70, 547–568 (1988). https://doi.org/10.1007/BF00682165

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  • DOI: https://doi.org/10.1007/BF00682165

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