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

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. It is found that, due to the inclusion of quantum fluctuations, the AF order decays with increasing doping much faster than obtained in the Hartree-Fock theory. Under an intermediate constant U the calculated doping evolution of the spectral intensity in the AF state has satisfactorily reproduced the experimental results, without need of a strongly doping-dependent U as argued earlier. This may reconcile a discrepancy in recent studies on photoemission and optical conductivity.