Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)

O 43.1: Poster

Tuesday, February 26, 2008, 18:30–19:30, Poster F

The Kondo-resonance in photoemission spectra on ordered Ce surface alloys — •Markus Klein¹, Christina Albers¹, Juarez Da Silva³, Kevin Beach², Fakher Assaad², and Friedrich Reinert¹ — ¹Universität Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg, Germany — ²Universität Würzburg, Theoretische Physik I, Am Hubland, 97074 Würzburg, Germany — ³National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA

The physical properties of Kondo systems are determined by interactions between localized f-states and conduction electrons. Of particular interest are low-dimensional systems as they can serve as elementary model systems. Due to its surface sensitivity angle-resolved photoelectron spectroscopy (ARUPS) is an excellent tool to study directly the electronic structure of a two-dimensional Kondo system. This requires highly ordered and ultra thin singlecrystalline films. We have prepared singlecrystalline Ce surface-alloys by in situ deposition of Ce on noble metal surfaces. Our ARUPS results show a temperature and wave-vector dependent Kondo-resonance and other hybridization effects. We discuss our spectroscopic results with the help of data from isostructural La films, LDA+U, and DMFT calculations.