Interband pairing in extended two- and three-band Hubbard model

TL;DR

This paper investigates how interband pairing in extended multi-band Hubbard models can significantly enhance superconducting critical temperatures, making high-temperature superconductivity more experimentally feasible.

Contribution

It demonstrates that including interband pairing substantially raises the critical temperature, reducing the required interaction strength for high-temperature superconductivity.

Findings

Interband pairing increases the critical temperature.

Interband pairing reduces the needed interaction constant.

Enhances the realism of high-temperature superconductor models.

Abstract

We study the existence of intraband and interband pairing in the extended two band and three-band Hubbard model. It is shown that including interband pairing significantly increases the superconducting critical temperature in comparison with critical temperature of the intraband pairing. This increase allows for decrease of the nearest-neighbor interaction constant necessary for critical temperature in high temperature superconductors to the realistic values.