Dynamical spin susceptibility and the resonance peak in the electron-doped cuprate superconductors

We present a study of the dynamical spin susceptibility in the electron-doped cuprate superconductors. We show that the resonance peak observed recently in Pr0.88LaCe0.12CuO4-δ represents rather an effect of the magnetic coherence than a bound state seen in the hole-doped counterparts. We further analyze some aspects of the peculiar behavior of the spin excitations in the presence of the spin density wave (SDW) instability in dx2-y2-wave superconducting state (TN llTC). We find that the spin resonance will show a remarkable temperature dependence in contrast to the hole-doped cuprates. Furthermore we investigate the influence of a Zeeman-magnetic field on the resonance. (orig.)