Long-Range Coulomb Effect on the Antiferromagnetism in Electron-doped Cuprates

TL;DR

This paper uses mean-field theory to explore how long-range Coulomb interactions influence antiferromagnetism in electron-doped cuprates, explaining Fermi surface evolution and pseudogap onset with doping.

Contribution

It demonstrates that Coulomb exchange effects significantly alter next nearest neighbor hopping, affecting antiferromagnetic properties in electron-doped cuprates.

Findings

Effective next nearest neighbor hopping increases with doping.

Fermi surface evolution aligns with Coulomb effect considerations.

Doping dependence of antiferromagnetic pseudogap onset is explained.

Abstract

Using mean-field theory, we illustrate the long-range Coulomb effect on the antiferromagnetism in the electron-doped cuprates. Because of the Coulomb exchange effect, the magnitude of the effective next nearest neighbor hopping parameter increases appreciably with increasing the electron doping concentration, raising the frustration to the antiferromagnetic ordering. The Fermi surface evolution in the electron-doped cuprate Nd$_{2-x}$Ce$_x$CuO$_4$ and the doping dependence of the onset temperature of the antiferromagnetic pseudogap can be reasonably explained by the present consideration.