Giant Cu 2p Resonances in CuO Valence-Band Photoemission

L.H. Tjeng, C.T. Chen, J. Ghijsen, P. Rudolf, F. Sette

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We report the observation of a giant resonance in the Cu 2p resonant-photoemission spectra of CuO. The study allows the unambiguous identification of the local Cu 3d8 configuration in the valence-band photoemission spectrum, providing conclusive evidence for the charge-transfer nature of the insulating gap in the electronic structure of CuO. A comparison with 3p resonant-photoemission measurements is also presented to emphasize the strength of 2p resonant photoemission as a tool for studying the electronic structure of highly correlated 3d transition-metal systems.
Original languageEnglish
Number of pages4
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 1991

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