@unpublished{19550,
  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.},
  author       = {Henheik, Sven Joscha and Langmann, Edwin and Lauritsen, Asbjørn Bækgaard},
  booktitle    = {arXiv},
  title        = {{Multi-band superconductors have enhanced critical temperatures}},
  doi          = {10.48550/arXiv.2409.17297},
  year         = {2024},
}