Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)

O 18.52: Poster

Montag, 25. Februar 2008, 18:30–19:30, Poster F

Investigation of the low dimensional surface system Pt(110) by angle-resolved UV-photoemission — •Peter Amann, Mariana Minca, Michael Cordin, Alexander Menzel, and Erminald Bertel — Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria

Photoemission of low dimensional systems is of major importance for the investigation of correlation. The Pt(110) system provides quasi one dimensional d-derived surface resonances which bear a divergent DOS at the Fermi level due to a 2D saddle point topology. Therefore one can expect maxima in the response function at wave vectors connecting the saddle points. Furthermore a strong temperature anomaly of the adsorbate covered system Br/Pt(110) is observed. As the c(2x2) phase is cooled down from RT to 50K it undergoes a phase transition and two new phases, the (3x2) and the p(2x1), additionally appear [1]. The various surface systems as well as possible driving mechanisms (e.g. Fermi-surface nesting) for the transitions are discussed. Additionaly a detailed investigation of the saddle point topology is done by temperature dependent Fermi-surface measurements.

[1] E. Dona et. al. Phys. Rev. Lett. 89, 186101 (2007)