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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.20: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

SnPc on Ag(111) investigated by STM — •Christoph Kleimann, Ingo Kröger, Christian Weiss, Christa Elsaesser, Benjamin Stadtmüller, and Christian Kumpf — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany and JARA-Fundamentals of Future Information Technology

Tin(II)-phtalocyanine (SnPc) is a large, non-planar, organic molecule which shows a number of different structural phases when adsorbed on Ag(111). While at low coverages a gas-like phase was observed, larger coverages result in a series of ordered, incommensurate structures at room temperature, a behavior that indicates intermolecular repulsion. At low temperature the formation of commensurate SnPc islands was found within a certain range of coverage. These different phases have already been studied intensively in our group by SPA-LEED, XSW and other techniques [1]. Two different adsorption geometries have been identified using scanning tunneling microscopy (STM) in some of these structures: The central Sn atom can either be oriented towards (Sn down) or away from the surface (Sn up). Here we show STM measurements for different coverages at room temperature and low temperature. The results confirm and complement our previous findings and demonstrate that the fine interplay of molecule-molecule and molecule-substrate interactions is crucial for the structure formation in this system.

[1] Stadler et al, Nat.Phys. 5, pp 153-158 (2009)