Abstract
The oxocuprates Y2BaCuO5 and Bi2CuO4 the crystal structures of which contain discrete CuO5 and CuO4 units, respectively, have been investigated by angle integrated photoelectron spectroscopy. The Cu 2p core level and Cu L3VV Auger spectra are analysed within a simple cluster configuration interaction model. The experimental data and model parameters, namely the charge transfer energy Δ, the transfer integral T, and the correlation energy U as well as the main valence band features are similar as for oxocuprates with extended copper oxygen network.
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