  On the basis of the Hubbard model, we present the formulation of
antiferromagnetism in electron-doped cuprates using the fluctuation-exchange
approach. Taking into account the spin fluctuations in combination with the
impurity scattering effect due to the randomly distributed dopant-atoms, we
investigate the magnetic properties of the system. It is shown that the
antiferromagnetic transition temperature, the onset temperature of the
pseudogap formation, the single particle spectral density, and the staggered
magnetization obtained by the present approach are in very good agreement with
the experimental results. The distribution function in momentum space at very
low temperature is observed to differ significantly from that of the Fermi
liquid. Also, we find zero-energy peak in the density of states (DOS) of the
antiferromagnetic phase. This DOS peak is sharp in the low doping regime, and
disappears near the optimal doping where the AF order becomes weak.
