Abstract
We have studied the Cu 2p, Nd 3d and valence band x-ray photoemission spectra obtained forNd1.85Ce0.15CuO4−δ single crystal under different annealing conditions. It is found that both the2p3/23d10 andthe 2p1/23d10 peaks of the Cu 2p core level appear obviously upon oxygen reduction. Nd 3d spectra movetowards lower binding energy upon reduction. The valence band spectra show anincrease in itinerant electrons with 3d character upon reduction. All the changes ofthe Cu 2p, Nd 3d and valence band spectra can be explained in terms of thedelocalization of itinerant electrons. We suggest that an annealing process could removeexcess oxygen and the associated disordered potential making the conductiveelectrons delocalized with the result that superconductivity becomes possible.
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