Some phenomenological theoretical aspects of intrinsic superfluid critical velocities

Phys. Rev. B 45, 2512 – Published 1 February 1992
Richard E. Packard and Stefano Vitale


We use a phenomenological theory of superfluid critical velocities in small orifices to explain three phenomena: (1) The low-temperature intrinsic critical velocity vc in dc experiments should depend logarithmically on the driving pressure head; the logarithmic increment in vc is the width of the velocity distribution function for phase slips. (2) The critical velocity measured in dc experiments is related to that seen in ac experiments through the quantum number of the phase slips involved. (3) It is possible that quantum tunneling processes may be significant at temperatures as high as 0.3 K.


  • Received 9 September 1991
  • Published in the issue dated 1 February 1992

© 1992 The American Physical Society

Authors & Affiliations

Richard E. Packard

  • University of California, Berkeley, California 94720

Stefano Vitale

  • University of Trento and Istituto Nazionale di Fisica Nucleare, I-38050 Povo, Trento, Italy

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