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Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 4: Epitaxie und Wachstum I

O 4.7: Talk

Friday, March 4, 2005, 12:15–12:30, TU EB202

Temperature dependent evolution of Au/Pd(110) structure — •Marko Kralj1, Stefan Degen1, Aleksander Krupski1, Conrad Becker1, Klaus Wandelt1, Aude Bailly2, Marie-Claire Saint-Lager2, Pierre Dolle2, and Robert Baudoing-Savois21Institut für Physikalische Chemie, Bonn, Germany — 2Laboratoire de Cristallographie, Grenoble, France

Ultra thin gold films on Pd(110) are studied by surface x-ray diffraction (SXRD) and scanning tunneling microscopy (STM). The focus is set to a 2.5 atomic layers thick gold film. The evolution of the room temperature deposited film structure and morphology is investigated as a function of annealing temperature in the range of 300-580 K. With increasing temperature the film order increases and the surface plane exhibits a (1×2) missing row reconstruction. Also, after 500 K, a competitive process of alloying with the palladium substrate takes place. A diffuse component is observed when performing transverse SXRD scans along the (01L) crystal truncation rod. This diffuse intensity is present only in one direction and is thus induced by No-dqdefectsNo-dq of anisotropic form. We propose a consistent model which clearly relates this effect to the STM data.

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