Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 70: Poster Wednesday: Electronic Structure
O 70.3: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Orbital surface reconstruction on SrTiO3 studied with resonant x-ray reflectometry — •Benjamin Katter1, Volodymyr Zabolotnyy1, Eugen Weschke2, Lennart Dudy1, Ozan Kirilmaz1, Sebastian Macke3, Michael Sing1, Ralph Claessen1, Robert Green4, and Vladimir Hinkov1 — 1Experimentelle Physik IV, Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany — 2BESSY II, Helmholtz-Zentrum Berlin for Materials and Energy, 12489 Berlin, Germany — 3Max Planck Institute for Metals Research, Heisenbergstraße 3, 70569 Stuttgart, Germany — 4Department of Physics & Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z1, Canada
Transition metal oxides, like all crystalline solids, can show reconstruction effects at their surface due to breaking of the crystal symmetry. In titanium terminated SrTiO3, in which the surface symmetry is lowered from Oh to D4h, we observe a lifting of orbital degeneracy and shifting of orbital energies of Ti at the surface. To explore this, we have used Resonant X-ray reflectometry (RXR) to analyze orbital reconstruction at the surface of SrTiO3 by combining surface and bulk sensitive reflectometry scans. We found a reconstructed surface layer of up to two unit cells in size where the optical constants of Ti were anisotropic. We fit and explain our results using crystal field theory.