Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Oxides and Insulator Surfaces II

O 89.7: Vortrag

Donnerstag, 10. März 2016, 16:45–17:00, H4

Software-based analysis of aperiodic structures of quasicrystals — •Berit Schreck1, Stefan Förster1, René Hammer1, Klaus Meinel1, and Wolf Widdra1,21Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany

The discovery of a novel class of oxide quasicrystals (OQC) leads to a new field in surface and material science research. BaTiO3 develops a 2D structure of twelve-fold rotational symmetry when prepared as thin film on Pt(111) [1]. In order to determine the atomic structure and the statistics of the tiling, a software based approach for the drift correction and the extraction of atomic coordinates from atomically resolved STM images has been developed. The OQC structure is composed by an aperiodic arrangement of triangular, quadratic, and rhombic building blocks, comparable to the Stampfli-Gähler-Tiling [2]. Angles, edge lengths, and frequency of occurre of the OQC tiling elements have been extracted and will be compared with the theoretical model.

[1] Förster, S. et al., Nature 502, 215 (2013). [2] Gähler, F. in Quasicrystalline Materials, Ch. Janot and J.M. Dubois (eds.), World Scientific (1988).

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