Spin dynamics in the antiferromagnetic phase for electron-doped cuprate superconductors

TL;DR

This study uses the $t$-$t'$-$t''$-$J$ model to calculate spin susceptibilities in electron-doped cuprates' antiferromagnetic phase, predicting doping-dependent resonance peaks observable in neutron scattering.

Contribution

It introduces a detailed theoretical analysis of spin dynamics in electron-doped cuprates using slave-boson mean-field theory and RPA, highlighting new resonance features with doping.

Findings

Resonance peaks appear around (0.3π,0.7π) with doping.

Peaks are prominent in transverse susceptibility.

Predicted features are relevant for neutron scattering experiments.

Abstract

Based on the $t$-$t'$-$t''$-$J$ model we have calculated the dynamical spin susceptibilities in the antiferromagnetic (AF) phase for electron-doped cuprates, by use of the slave-boson mean-field theory and random phase approximation. Various results for the susceptibilities versus energy and momentum have been shown at different dopings. At low energy, except the collective spin-wave mode around $(\pi,\pi)$ and 0, we have primarily observed that new resonance peaks will appear around $(0.3\pi,0.7\pi)$ and equivalent points with increasing doping, which are due to the particle-hole excitations between the two AF bands. The peaks are pronounced in the transverse susceptibility but not in the longitudinal one. These features are predicted for neutron scattering measurements.