Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.15: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Self-assembling and electronic structure of metallocenes on Pb(111) and Pb(100) — •Wibke Bronsch, Benjamin Heinrich, and Katharina Franke — Freie Universität Berlin, Germany

Metallocene molecules are promising candidates for future spintronic applications. However, in contact to metallic leads their stability has recently been discussed [1,2]. Employing low-temperature scanning tunneling microscopy, we show that ferrocene on Pb(111) and Pb(100) forms self-assembled islands, in which the molecular axis is almost parallel to the surface normal. Dissociation of the molecules occurs when the molecules are forced to closer distance, as e.g. at dislocation lines or higher molecular coverages. Tunneling spectroscopy reveals that the HOMO and LUMO are mainly localized on the cylcopentadienyl rings. In agreement with the spin singlet state of the free molecule, we do not find any indication of magnetic interaction with the substrate.

[1] Braun, K.-F. et al., Phys. Rev. Lett. 96, 246102 (2006)

[2] Heinrich, B. W. et al., Phys. Rev. Lett. 107, 216801 (2011)