Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.82: Poster
Montag, 26. März 2007, 17:30–20:30, Poster C
Electronic Structure of Mn12 Derivatives on the Clean and Functionalized Au(111) Surface — •Sönke Voss1, Mikhail Fonin1, Michael Burgert2, Yuriy S. Dedkov3, Ulrich Groth2, and Ulrich Rüdiger1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz — 2Fachbereich Chemie, Universität Konstanz, 78457 Konstanz — 3Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden
Single-molecule magnets (SMMs) like Mn12-acetate and its derivatives have attracted much attention due to their unique magnetic properties such as quantum tunneling of magnetization. Up to date, most experiments on Mn12 have been performed on bulk material while there are only a few reports on transport properties and electronic structure of individual molecules. Here, we present a study on the electronic structure of monolayers of Mn12 SMMs grafted on clean as well as on functionalized Au(111) surfaces. X-ray absorption spectroscopy indicates the fragmentation of the Mn12-core after deposition on clean Au(111). However, resonant photoemission spectroscopy was employed to show that the structural integrity of Mn12 clusters can be retained by using an appropriate pre-functionalization of the Au(111) surface. The obtained spectra are in good agreement with previous LDA+U calculations [1]. Scanning tunneling microscopy and spectroscopy measurements confirm the ResPES results for the valence band structure near EF.
[1] Boukhvalov et al., J. Electron Spectrosc. Relat. Phenom. 137-140, 735 (2004).