Pseudogap associated with precursor pairing

TL;DR

This paper proposes that electron pairing, not off-diagonal long-range order, is sufficient for superconductivity, and identifies a pseudogap state linked to pairing near the Mott transition, suggesting high-temperature superconductivity occurs in this regime.

Contribution

It challenges the necessity of off-diagonal long-range order for superconductivity and introduces a pseudogap state associated with real-space pairing near the Mott transition.

Findings

Superconductivity can occur without off-diagonal long-range order.

A pseudogap state is linked to electron pairing in real space.

High-temperature superconductivity is found near the Mott transition.

Abstract

This work argues that the off-diagonal long range order (ODLRO) is not necessary for showing superconductivity while the electron pairing around Fermi surface is sufficient for superconductivity. It is shown that there exists the pseudogap state associated with the electron pairing in real space and the high temperature superconductivity could be only found in the metallic region near the Mott metal insulator transition (MIT).