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O: Oberflächenphysik

O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)

O 14.7: Poster

Montag, 27. März 2006, 18:00–21:00, P2

Order on a disordered layer: Dy chain structures on Mo(112) — •C. Tegenkamp¹, A. Fedorus², A. Naumovets², J. Zachariae¹, and H. Pfnür¹ — ¹Institut für Festkörperphysik, Abteilung Oberflächen, Appelstr. 2, 30167 Hannover, Germany — ²Institute of Physics, Natl. Academy of Sciences, Prospect Nauki 46, UA-03039, Kyiev-39,Ukraine

The formation of atomic chain structures on surfaces by self assembly is inevitably related to a characteristic interaction mechanism between them. Even more, the coupling determines strongly the electronic property of single chains. For a variety of electropositive metals adsorbed on either anisotropic (110)-fcc or (112)-bcc metal surfaces the formation of (nx1) structures (n=5,7,8,9..)have been observed and can be explained by Friedel oscillations along a surface state.

In contrast, the Dy/Mo(112) system shows a less pronounced interaction, because the system forms a 2D glass phase, i.e. surface alloying takes place for annealing temperatures higher than 300K and coverages up to 0.5ML. Interestingly, on top of this disordered phase the growth of ordered chain structures is possible, as revealed by STM and LEED experiments, i.e. the formation of (2x1), (4x1) and (5x1) structures have been found for inital coverages higher than 0.8ML Dy [1]. Furthermore, for coverages between 0.6 and 0.8ML a rectangular (7x1) and a uniaxial incommensurate (5x1) phase have been identified and will be discussed.

[1] A. Fedorus et.al. Eur. Phys. J.B 24 (2001) 395.