Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Oxides and Insulator Surfaces II

O 89.8: Vortrag

Donnerstag, 10. März 2016, 17:00–17:15, H4

Transition metal-oxide hybrid chain structures on Ir(100) - a general trend? — •Pascal Ferstl1, Florian Mittendorfer2, Christopher Sobel1, Matthias Gubo1, Klaus Heinz1, Josef Redinger2, M.Alexander Schneider1, and Lutz Hammer11Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg — 2Institut für Angewandte Physik & CMS, TU Wien

We show that the oxidation of a 1/3 monolayer of different transition metals (Mn, Co, Fe and Ni) on the Ir(100) surface leads to the formation of a surface oxide of nearly the same crystallographic structure. All of the metals (Me) form quasi-one-dimensional chains of MeO2 stoichiometry and grow exclusively with threefold lateral spacing on the plain Ir(100) terraces forming an almost defect-free 3×1 superstructure. This allows for a quantitative determination of the crystallographic structure of the chains by means of full dynamical LEED-IV analyses which resulted in Pendry R-factor values around 0.11 for all investigated systems. The best fit structures were independently confirmed by DFT calculations. The MeO2 stripes only bind via the oxygen atoms to the substrate, while the central mono-atomic metal wire is decoupled from its Ir neighbours. The only notable difference between the various metal-oxide hybride structures is the buckling of the Me atom with respect to the first Ir layer that varies between 1.1 and 0.7 Å.

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