Abstract
Resonant photoemission measurements have been performed on well characterized, stoichiometric (10 1 2) surfaces of single-crystal Cr 2O 3 using synchrotron radiation. A strong resonant enhancement of the highest-lying valence-band states is observed across the Cr 3p → 3d excitation threshold. In light of the similarity of the resonance in Cr 2O 3 with that of Ti 2O 3 and V 2O 3, we conclude that Cr 2O 3 is a Mott-Hubbard insulator. Cr 3d - O 2p hybridization is evidenced by the presence of the similar, but weaker, resonant enhancement in the O 2p valence-band region.
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