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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.65: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B1

CoO(111) bilayer on Ir(100) revisited: An incommensurate Moiré overlayer with strong local binding — Florian Mittendorfer¹, •Josef Redinger¹, Raimund Podloucky², Michael Weinert³, Carsten Tröppner⁴, Tobias Schmitt⁴, Martina Reuschl⁴, Lutz Hammer⁴, and M. Alexander Schneider⁴ — ¹Applied Physics, TU Vienna, Austria — ²Physical Chemistry, Vienna University, Austria — ³Dept. of Physics, University of Wisconsin-Milwaukee, USA — ⁴Solid State Physics, University Erlangen-Nuremberg, Germany

Although a CoO(111) bilayer on Ir(100) is a relaxed overlayer with a very strong structural response to the lateral modulation of the interface [1], it turns out to form an one-dimensional incommensurate Moiré structure [2] as revealed by large-scale, low-temperature STM topographies. Despite the non-commensurability of the film, the binding to the substrate is site specific, where the strong lateral modulation of the structural elements within the oxide film can be understood as a combination of the lateral variation in the Co-Ir binding potential and additional O-Ir binding. This is in agreement with recent DFT investigations of the complex magnetism in a CoO(111) bilayer on Ir(100) [3], which found energetic degeneracies with respect to registry shifts of the CoO(111) film along the [011] direction and predicted a registry shifted structure to be equally stable as the LEED structure in [1].

[1] C. Ebensperger et al., Phys. Rev. B 81, 235405 (2010)

[2] C. Tröppner et al., Phys. Rev. B, accepted (2012)

[3] F. Mittendorfer et al., Phys. Rev. Lett. 109, 015501 (2012)