Tc degradation by the Coulomb interaction in anisotropic disordered superconductors

O. Entin-Wohlman, H. Gutfreund, M. Weger

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The authors calculate the depression of Tc caused by the effect of a short mean free path on the Coulomb repulsion, for the special case of a very anisotropic superconductor. Specifically, they consider the linear chain model for A15 superconductors with a large difference between the in-chain and inter-chain scattering rates. Previous work based on the McMillan equation for Tc gave a large reduction in Tc. In this work they find Tc numerically from the Eliashberg equations. They find that the reduction of Tc due to this effect is about 25% to 30%, which is considerably less than observed experimentally. The effective Coulomb term is retarded, and as a result is frequency dependent. It is affected by the disorder mainly at small frequencies ( approximately 10 meV).

Original languageEnglish
Article number021
Pages (from-to)1545-1553
Number of pages9
JournalJournal of Physics F: Metal Physics
Issue number10
StatePublished - 1 Dec 1986
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys


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