CU 2P X-RAY-ABSORPTION AND CU 2P-3D RESONANT PHOTOEMISSION SPECTROSCOPY OF LACUO3

In order to study the effect of intercluster interaction on the high-e nergy spectroscopy of formally Cu3+ oxides, we have performed X-ray ab sorption spectroscopy (XAS) and Cu 2p-3d resonant photoemission spectr oscopy (RPES) studies of rhombohedrally distorted LaCuO3. In the Cu 2p XAS spectrum, the Cu 2p(3/2) main peak is split into two structures, indicating that the interaction between the CuO6 octahedral clusters i s strong. The valence-band RPES spectrum shows an enhanced satellite s tructure at similar to 12.5 eV, similar to that of Cu2+ oxides for the incident photon energies which create intermediate states well screen ed by the intercluster interaction. For the incident photon energy for the poorly screened intermediate state, the enhanced satellite struct ure becomes broad and has a maximum at similar to 13 eV. (C) 1998 Else vier Science B.V. All rights reserved.