Doping dependence of the electron-doped cuprate superconductors from the antiferromagnetic properties of the Hubbard model

TL;DR

This study uses the Kotliar-Ruckenstein slave-boson approach to analyze how antiferromagnetic properties in the Hubbard model vary with doping in electron-doped cuprates, aligning well with experimental data.

Contribution

It introduces a method that incorporates spin fluctuations, showing a faster decrease of AF order with doping and reproducing spectral intensity evolution without a doping-dependent U.

Findings

AF order decreases faster with doping when spin fluctuations are included.

Spectral intensity evolution matches experimental results with a constant U.

Reconciles discrepancies between photoemission and optical conductivity studies.

Abstract

Within the Kotliar-Ruckenstein slave-boson approach, we have studied the antiferromagnetic (AF) properties for the $t$-$t'$-$t''$-$U$ model applied to electron-doped cuprate superconductors. Due to inclusion of spin fluctuations the AF order decreases with doping much faster than obtained in the Hartree-Fock theory. Under an intermediate {\it constant} $U$ the calculated doping evolution of the spectral intensity has satisfactorily reproduced the experimental results, without need of a strongly doping-dependent $U$ as argued earlier. This may reconcile a discrepancy suggested in recent studies on photoemission and optical conductivity.