MULTISITE EFFECTS ON THE CORE-LEVEL PHOTOEMISSION INSr2RuO4

Kozo Okada
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Kozo Okada: Department of Physics, Faculty of Science, Okayama University, 3-1-1, Tsushima-naka, Okayama 700-8530, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1023-1027

Abstract: Multi-Ru-site effects on the photoemission from theRu3dcore level inSr2RuO4are discussed on the basis of numerical diagonalization calculations for large-size cluster models. It is shown that the electrons on theRu4dions neighboring the core-hole site participate actively in the core-hole screening, which indicates the importance of so-called "nonlocal screening" inSr2RuO4. However, since it occurs via theRu4d(xy)–O2pπbonding, the photoemission intensity which corresponds to the nonlocal screening is not large, compared with theCu2pphotoemission in high-Tc-related cuprates. From the spectral analysis, the Coulomb interaction strength betweenRu4delectrons is estimated to be comparable with the width ofRudεbands. In other words,Sr2RuO4belongs to a category of strongly correlated electron systems.

Date: 2002
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DOI: 10.1142/S0218625X02003287

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