SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Electronic Structure of Surfaces II
O 85.1: Talk
Thursday, March 30, 2023, 15:00–15:15, REC C 213
Electronic structure of transition metal oxide surfaces from coincident electron spectroscopy — •Danilo Kühn1, Swarnshikha Sinha1,2, Artur Born1,2, Fredrik O. L. Johansson3, Ruslan Ovsyannikov1, Nils Mårtensson3, and Alexander Föhlisch1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany — 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany — 3Department of Physics and Astronomy, Uppsala University, P.O. Box 256, 751 05, Uppsala, Sweden
Transition metal oxides are a much studied class of materials with a wide range of applications, e.g. solar cells, batteries, magnetic storage devices, sensors or pigments. Varying charge localizations in the s,p and d valence shells and coupling between subsystems invoke complex electronic, magnetic and optical phases as high Tc superconductivity. Here, results from the new COESCA station for coincident electron spectroscopy at the BESSY II synchrotron will be presented [Leitner, T. et al. J. El. Spec. 250, 147075 (2021)]. Combining the high transmission and energy resolution of ARTOF time-of-flight spectrometers with the tailored time structure of BESSY II, Auger- Photoelectron coincidence spectroscopy (APECS) is possible with unprecedented information rate in the soft x-ray regime. Exploiting enhanced chemical selectivity and surface sensitivity, we gain insight into the excitation-decay dynamics and electron correlation effects in Ni, Cu and their oxides [Born, A. et al. Sci Rep 11, 16596 (2021)]