High temperature superconductivity in metallic region near Mott transition

TL;DR

This paper investigates spin-singlet superconductivity driven by electron correlations in an extended Hubbard model, highlighting that high-temperature superconductivity occurs near the Mott transition where correlations and density of states are sufficiently strong.

Contribution

It demonstrates that high-temperature superconductivity requires strong correlations and a high density of states near the Fermi level in the metallic region close to the Mott transition.

Findings

Superconductivity requires strong correlations and high density of states.

High-temperature superconductivity is confined to the metallic region near the Mott transition.

Properties of superconductors are discussed based on these conditions.

Abstract

The spin-singlet superconductivity without phonons is examined in consideration of correlations on an extended Hubbard model. It is shown that the superconductivity requires not only the total correlation should be strong enough but also the density of state around Fermi energy should be large enough, which shows that the high temperature superconductivity could only be found in the metallic region near the Mott metal insulator transition (MIT). Other properties of superconductors are also discussed on these conclusions.