How interband pairing increases the superconductive transition temperature

TL;DR

This paper investigates how interband pairing mechanisms can significantly enhance the superconducting transition temperature in two-band materials, suggesting new pathways for high-Tc superconductor development.

Contribution

It introduces the importance of interband electron pairing in achieving high Tc and predicts new two-band materials with elevated transition temperatures.

Findings

Interband pairing is crucial for high Tc in two-band superconductors.

Strong electron-phonon coupling enhances pairing across the entire electron band.

Predicted existence of new two-band high-temperature superconductors.

Abstract

The possible strong electron-phonon coupling and the pairing within the full width of the electron band and not only in a narrow sheet near the Fermi surface are taken into account. It is found that the effect of pairing of electrons belonging to different bands is crucial to the appearance of high Tc in some two-band materials. The existence of another set of the two-band high temperature materials with transition temperature Tc, not yielding Tc in cuprates, is predicted.