Characteristic energy of the nematic-order state and its connection to enhancement of superconductivity in cuprate superconductors

TL;DR

This paper investigates how the characteristic energy of the nematic-order state in cuprate superconductors varies with doping and its potential link to enhanced superconductivity, using a kinetic-energy-driven theoretical framework.

Contribution

It provides a theoretical analysis of the doping dependence of the nematic-order characteristic energy and its correlation with superconductivity in cuprates, aligning with experimental data.

Findings

Nematic-order characteristic energy is largest in underdoped cuprates.

This energy decreases smoothly with increased doping.

A similar trend is observed between nematic energy and superconducting transition temperature.

Abstract

The new development in sublattice-phase-resolved imaging of electronic structure now allow for the visualisation of the nematic-order state characteristic energy of cuprate superconductors in a wide doping regime. However, it is still unclear how this characteristic energy of the nematic-order state is correlated with the enhancement of superconductivity. Here the doping dependence of the nematic-order state characteristic energy in cuprate superconductors and of its possible connection to the enhancement of superconductivity is investigated within the framework of the kinetic-energy-driven superconductivity. It is shown that the characteristic energy of the nematic-order state is found to be particularly large in the underdoped regime, then it smoothly decreases upon the increase of doping, in full agreement with the corresponding experimental observations. Moreover, the characteristic energy of the nematic-order state as a function of the nematic-order state strength in the underdoped regime presents a similar behavior of the superconducting transition temperature. This suggests a possible connection between the nematic-order state characteristic energy and the enhancement of the superconductivity.