Stability of supercurrents and condensates in type I superconductors

Regular Article

Abstract

Excitations of Cooper pairs into non-condensed bound pairs are similar to excitations of true bosons out of the Bose-Einstein condensate. Using the Landau criterion of superfluidity we evaluate the critical current above which these pair-excitations would lead to a finite resistivity. The predicted value strongly depends on the chosen approximation. The Thouless approach based on the Galitskii T-matrix and the Kadanoff-Martin theory which is in many aspects equivalent to the BCS theory, both lead to zero critical velocity, what is in conflict with the mere existence of supercurrents. In contrast, the T-matrix with multiple scattering corrections provides the critical velocity of pair excitation which is √3-times larger than the critical velocity of pair breaking. This agrees with the experimentally well established fact that supercurrents in type I superconductors are limited by pair breaking, not by pair excitation.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • P. Lipavský
    • 1
  • K. Morawetz
    • 2
    • 3
    • 4
  • B. Šopík
    • 5
  • M. Männel
    • 2
  1. 1.Faculty of Mathematics and Physics, Charles UniversityPrague 2Czech Republic
  2. 2.Münster University of Applied SciencesSteinfurtGermany
  3. 3.International Institute of Physics (IIP)NatalBrazil
  4. 4.Max-Planck-Institute for the Physics of Complex SystemsDresdenGermany
  5. 5.Central European Institute of Technology, Masaryk UniversityBrnoCzech Republic

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