Correlation satellite driven by reduced dimensionality

¹ BESSY-Lentzeallee 100, D-14195 Berlin, Germany
² Department of Physics, University of Tokyo - 7-3-1 Hongo, Tokyo, 113 Japan
³ Institut für Festkörperforschung, Forschungszentrum Jülich - D-52425 Jülich, Germany
⁴ Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
⁵ IBM Thomas J. Watson Research Center-Yorktown Heights, NY 10598
⁶ Institute for Solid State Physics, University of Tokyo 7-22-1 Roppongi,Tokyo 106, Japan

Received: 25 February 1997
Accepted: 8 July 1997

Abstract

Photoelectron spectra of the ordered surface alloy CuMn/ Cu(100) show distinct valence band spectral features at higher binding energy, which are most pronounced for the optimal CuMn superstructure at half-monolayer Mn deposition. Our analysis comprising resonant photoemission, core level photoemission, inverse photoemission, first-principles local-density calculations, and configuration-interaction cluster-model calculations shows that the data represent the first observation of a valence band satellite caused by the increased electron correlation in an ultrathin metal film.