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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.35: Poster

Donnerstag, 23. März 2017, 17:00–19:00, P1C

Surface reconstruction in STO: Experimental and theoretical optical constants — •B. Katter¹, V. B. Zabolotnyy¹, C. Schüßler-Langeheine², E. Schierle², L. Dudy¹, O. Kirilmaz¹, S. Macke⁴, M. W. Haverkort³, and V. Hinkov¹ — ¹Universität Würzburg — ²Helmholtz-Zentrum Berlin für Materialien und Energie — ³Universität Heidelberg — ⁴Max-Planck-Institut Stuttgart

Transition metal oxides, like all crystaline solids, can show reconstruction effects at their surface due to breaking of the crystal symmetry. In SrTiO₃ missing oxygen at the surface lifts the orbital degeneracy and effectively lowers the symmetry from O_h do D_4h, which leeds to anisotropy of the optical constants in the surface layer. We have implemented a matrix formalism to study SrTiO₃ with surface reconstruction using resonant X-ray reflectometry. This allows us to extract the optical constants of the anisotropic system from experimental data. These in turn can be compared to crystal field calculations, which helps to understand the orbital reconstruction on a microscopic level.