Route to phonon-mediated high-temperature unconventional superconductivity

We investigate the appearance of superconductivity in a model with Peierls electron-phonon coupling for very low carrier concentrations. Superconductivity with very high critical temperatures is found to occur at all carrier concentrations if the electron-phonon coupling is not too weak, with a gap of s + s* symmetry that closes on the Fermi surface for appropriate parameters. The possibility of finding the elusive p-type superconductivity is also revealed, although this turns out not to be stable within the approximations we use.

Automated summary

The study found that superconductivity with very high critical temperatures can occur at all carrier concentrations if the electron-phonon coupling is not too weak, with a gap of s + s* symmetry closing on the Fermi surface for appropriate parameters. Additionally, the possibility of finding p-type superconductivity was revealed, although it was found to be unstable within the approximations used in the study.