X-Ray and Inner-Shell Processes
Vol. 1

J. Phys. Colloques 48 (1987) C9-1179-C9-1184
DOI: 10.1051/jphyscol:19879212

Cu 3d⁹ - LIGAND HOLE CONFIGURATION IN YBa₂ Cu₃ O_~7 BY X-RAY SPECTROSCOPIES

A. BIANCONI¹, A. CLOZZA¹, A. CONGIU CASTELLANO¹, S. DELLA LONGA¹, M. DE SANTIS¹, A. DI CICCO¹, K. GARG¹, P. DELOGU², A. GARGANO², R. GIORGI², P. LAGARDE³, A.M. FLANK³ and A. MARCELLI<sup>4

1</sup>  Dipartimento di Fisica, Università degli Studi di Roma "La Sapienza", I-00185 Roma, Italy
²  ENEA, Centro Ricerche Casaccia, Laboratorio Superfici e Metallurgia Fisica, Via Anguillarese 301, I-00060 Roma, Italy
³  LURE, CNRS-CEA-MEN, Bât. 209C, Université Paris-Sud, F-91405 Orsay Cedex, France
⁴  INFN, Laboratori Nazionali di Frascati, I-00044 Frascati. Italy

Abstract
Cu K edge and L₃ edge x-ray absorption near edge structure (XANES) and Cu L₃ x-ray photoelectron spectroscopy (XPS) of YBa₂Cu₃O₇ have been measured to determine the local electronic structure. The K-edge XANES have been interpreted by multiple scattering approach. The data show the formation of the 3d⁹L (where L is a hole in the oxygen derived band, ligand hole ) many body configuration in the initial state of the superconducting oxide.