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Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Nanostructures at Surfaces II

O 22.1: Talk

Monday, March 11, 2013, 16:00–16:15, H45

Self-assembly of Fe cluster superlattice in metal-organic networkMarina Pivetta1, •Giulia E. Pacchioni1, Uta Schlickum1,2, Johannes V. Barth3, and Harald Brune11Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — 2Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany — 3Physik Department E20, Technische Universität München, D-85748 Garching, Germany

We studied the self-assembly of Fe clusters and adatoms in a metal-organic honeycomb network on Cu(111) by means of low-temperature scanning tunneling microscopy. The network is formed by coordination of dicarbonitrile pentaphenyl molecules to Cu adatoms. Fe atoms landing on the metal surface are mobile and are steerd by the quantum confinement of the surface state electrons towards the center of the network hexagonal cavities. In cavities with more than one Fe atom, preferential interatomic distances are observed. Upon gentle annealing the adatoms in each hexagon aggregate into a single cluster. These clusters are again centered in the cavities and their size is discerned by their distinct apparent heights.

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