Journal of Low Temperature Physics

, Volume 116, Issue 1, pp 21–60

Phase Diffusion and Suppression of the Supercurrent by Quantum-Mechanical Fluctuations of the Josephson Plasma at Small Superconducting Point Contacts

  • K. Gloos
  • F. Anders

DOI: 10.1023/A:1021874709355

Cite this article as:
Gloos, K. & Anders, F. Journal of Low Temperature Physics (1999) 116: 21. doi:10.1023/A:1021874709355


The RCSJ model of resistively and capacitively shunted Josephson junctions is used to describe superconducting point contacts over a wide range of resistances up to the metallic–tunneling transition. Their small dynamic capacitance of order C = 0.1 fF due to the point-contact geometry results in a huge plasma frequency. The critical current is then strongly suppressed and the contact resistance becomes finite because of quantum-mechanical zero-point fluctuations of the Josephson plasma and the rather large escape rate out of the zero-voltage state due to quantum tunneling. We test the predictions of the RCSJ model on the classical superconductors lead, indium, aluminum, and cadmium.

Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • K. Gloos
    • 1
    • 2
  • F. Anders
    • 1
  1. 1.Institut für FestkörperphysikTechnische Universität DarmstadtDarmstadtGermany
  2. 2.Max-Planck-Institut für chemische Physik fester StoffeDresdenGermany

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