Dresden 2003 – scientific programme

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M: Metallphysik

M 11: Grenzfl
ächen I

M 11.2: Talk

Monday, March 24, 2003, 10:30–10:45, IFW D

Strain-induced incomplete wetting at Cu_0.5Au_0.5 (001)-surfaces — •Werner Schweika¹, Harald Reichert², Waldemar Babik¹, Oliver Klein², and Simon Engemann² — ¹Institut für Festkörperforschung, Forschungszentrum Jülich — ²Max-Planck-Institut für Metallforschung, Stuttgart

By in-situ x-ray reflectivity measurements we observed an ordered layer near the (001) surface of a CuAu single crystal well above the bulk transition temperature. An Au-rich uppermost layer induces a temperature dependent oscillating order profile perpendicular to the surface. A complete wetting by this ordered layer is prohibited by strong lattice relaxations between the tetragonal near surface structure and the cubic disordered bulk. The Parrat recursion formalism was used to model the Fresnel reflectivities resolving the electron density distributions on an atomic scale.