Effect of charge ordering on superconductivity in high-temperature superconductors

TL;DR

This paper investigates how charge ordering influences superconductivity in high-temperature superconductors, proposing a condition where increased normal state energy due to charge order triggers the superconducting transition.

Contribution

It introduces a theoretical relation linking charge gaps in the superconducting phase to bandgap widths in the undoped insulating phase.

Findings

Charge ordering increases normal state energy of conducting layers.

Superconducting transition occurs when charge ordering energy exceeds certain energy differences.

Derived a relation between charge gap and bandgap width in high-temperature superconductors.

Abstract

It is shown that charge ordering in layered crystalline metals causes an increase in the normal state energy of the conducting layers. If this increase in the energy exceeds the difference between the superconducting state energy and the normal state energy of the metal, then the superconducting transition occurs. A relation between the charge gap in the superconducting phase and the bandgap width in the undoped insulating phase of high-temperature superconductors is obtained.