Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Oxides and Insulators: Clean Surfaces
O 59.4: Vortrag
Donnerstag, 29. März 2007, 16:30–16:45, H41
Stability, atomic and electronic structure of reduced Fe3O4(111) surfaces — •Markus Paul1, Michael Sing1, David Schrupp2, Ralph Claessen1, and Victor Brabers3 — 1Lehrstuhl für Experimentelle Physik IV, Universität Würzburg, Germany — 2Lehrstuhl für Experimentalphysik II, Universität Augsburg, Germany — 3Department of Physics, Eindhoven University of Technology, The Netherlands
Polar faces of ionic materials present a challenge for the determination of the atomic structure. Underlying difficulties are the relative stability and variability of such surfaces which can cause a poor reproducibility in the experiment or the coexistence of different structures on the same surface. In this work Magnetite(111) single crystal surfaces have been studied by STM, LEED and XPS under different in situ preparation conditions and stoichiometries, accordingly. The coexistence of several surface structures has been detected confirming only small differences in their relative stabilities . An unusual superstructure has been found for a reduced Fe1−xO-like surface layer. It is explained as originating from elastic strain formation due to lateral mismatch between Fe3O4 substrate and Fe1−xO-like overlayer.