Fluctuation-Exchange Study of Antiferromagnetism in Electron-Doped Cuprate Superconductors with Disorder

TL;DR

This study extends the FLEX approach within the Hubbard model to analyze antiferromagnetism in electron-doped cuprates, incorporating disorder effects to match experimental observations of magnetic and electronic properties.

Contribution

It introduces a modified FLEX method that includes dopant-induced disorder effects, providing a more accurate theoretical framework for electron-doped cuprate superconductors.

Findings

The model reproduces the doping dependence of the AF transition temperature.

It explains the pseudogap onset temperature related to spin fluctuations.

The spectral density and staggered magnetization match experimental data.

Abstract

On the basis of the Hubbard model, we extend the fluctuation-exchange (FLEX) approach to investigating the properties of antiferromagnetic (AF) phase in electron-doped cuprate superconductors. Furthermore, by incorporating the effect of scatterings due to the disordered dopant-atoms into the FLEX formalism, our numerical results show that the antiferromagnetic transition temperature, the onset temperature of pseudogap due to spin fluctuations, the spectral density of the single particle near the Fermi surface, and the staggered magnetization in the AF phase as a function of electron doping can consistently account for the experimental measurements.