Multi-band Superconductors have Enhanced Critical Temperatures
Abstract
Abstract We introduce a multi-band BCS free energy functional and prove that for a multi-band superconductor the effect of inter-band coupling can only increase the critical temperature, irrespective of its attractive or repulsive nature and its strength. Further, for weak coupling and weaker inter-band coupling, we prove that the dependence of the increase in critical temperature on the inter-band coupling is (1) linear, if there are two or more equally strongly superconducting bands, or (2) quadratic, if there is only one dominating band.
Fields of Study & Subjects
Superconductivity in MgB2 and Alloys
Publication details
- Journal / source
- Annales Henri Poincaré
- Publisher
- Springer Science and Business Media LLC
- Publication date
- 29 June 2026
- Language
- EN