Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Bio- and Molecular Magnetism

MA 31.6: Vortrag

Freitag, 30. März 2007, 12:15–12:30, H10

Electronic structure of Mn₁₂-complexes chemically grafted on Au(111) — •Mikhail Fonin¹, Sönke Voss¹, Michael Burgert², Yury Dedkov³, Ulrich Groth², and Ulrich Rüdiger¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany — ³Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany

Electronic properties of monolayers of Mn₁₂-complexes chemically grafted on the Au(111) surface have been studied in detail by means of scanning tunneling microscopy (STM) and spectroscopy (STS) as well as by x-ray absorption spectroscopy (XAS ) and photoemission spectroscopy (PES). XAS measurements reveal a significant deviation of spectra obtained from molecular monolayers from those obtained from single crystals indicating a partial fragmentation of the Mn₁₂ cores on the Au(111) surface. However, a large amount of Mn₁₂-molecules seems to retain their structural integrity upon surface deposition by using an appropriate combination of Mn₁₂ cluster and substrate functionalization. The Mn 3d partial density of states for the occupied states were extracted from the resonant PES spectra of Mn₁₂-complexes whereas the unoccupied states near E_F were probed by STS. The obtained density of states within E_F shows a very good agreement with previously reported LDA+U calculations [1].

[1] D. W. Boukhvalov et al., J. Electron Spectrosc. Relat. Phenom. 137-140, 735 (2004).