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

摘要

[[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 resonance peaks will appear around (0.3 pi,0.7 pi) and equivalent points with increasing doping, which are due to the single 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.