Abstract
The spin-fluctuation spectrum of electron-doped cuprate superconductors is calculated using the single-band Hubbard model with realistic tight-binding parameters and the fluctuation–exchange approximation. No strong incommensurate wings are found in the superconducting state in agreement with experiments. Our results imply that the magnetic response of electron-doped cuprates can be explained with the conventional Fermi-liquid approach. We also give a detailed comparison with a previous work, where the spin-fluctuation spectrum calculated with the random phase approximation was found to be dominated by incommensurate wings and thereby the Fermi-liquid approach was seriously questioned.
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