title: Two-photon photoemission from CoO layers on Ir(1 0 0).
abstract: Two-photon photoelectron spectroscopy is used to study the unoccupied electronic states of cobalt oxide layers on Ir(1 0 0). For thicker layers of (1 0 0) orientation the conduction band minimum is found 2 eV above the Fermi level. Layers with (1 1 1) orientation and thickness ≤4 bilayers show a peak around 3.4 eV energy and no evidence for the conduction band minimum. This is attributed to the metallic character of thin CoO(1 1 1) layers.
authors.affiliation: Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Otto
authors.forename: Thomas
authors.initials: T
authors.lastname: Fauster