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X-Ray Photoemission Spectroscopy of Nd2-xCexCuO4-y and La2-xSrxCuO4

We have measured the Cu 2p and O 1s X-ray photoemission spectra of the high-Tc superconductors Nd2-xCexCuO4-y and La2-xSrxCuO4, and the copper oxides CuO and Cu2O. The Cu 2p spectra of superconductors show features similar to those of CuO with divalent Cu ions. For Nd2-xCexCuO4-y, the intensity ratio of the satellite to the main peaks decreases with increasing Ce content. The O 1s spectra exhibit a single-peaked structure and are insensitive to whether either electron or hole is doped.