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Critical current of He3-A in narrow channels

M. T. Manninen, J. P. Pekola, R. G. Sharma*, and M. S. Tagirov

  • Low Temperature Laboratory, Helsinki University of Technology, SF-02150 Espoo 15, Finland

  • *Permanent address: National Physical Laboratory, New Delhi, India.
  • Permanent address: Physics Department, Kazan State University, Kazan 420008, USSR.

Phys. Rev. B 26, 5233 – Published 1 November, 1982

DOI: https://doi.org/10.1103/PhysRevB.26.5233

Abstract

The critical current Jc of superfluid He3-A in 0.8-μm-diam channels has been measured by the observation of the pressure difference along the channels versus the mass current. During warming Jc was found to decrease by about 30% at TBA(cyl) and by another 30% at TBA; TBA(cyl) is the reduced BA transition temperature in the narrow flow channels, with TBA(cyl)TBA=0.92 at 27.4 bars. Above TBA a second dissipative mechanism was observed at lower currents. These features are believed to be associated with the ends of the channels.

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