Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Magnetic Instrumentation and Characterization
MA 6.9: Vortrag
Montag, 20. März 2017, 11:30–11:45, HSZ 403
An element-selective probe of atomic polarization reminiscent of the linear Stark-effect — •Katharina Ollefs1,3, Verena Ney2, Fabrice Wilhelm3, Andrei Rogalev3, and Andreas Ney2 — 1Universität Duisburg-Essen and CENIDE, Germany — 2Johannes Kepler Universität, Austria — 3European Synchrotron Radiation Facility (ESRF), France
We have studied Co doped ZnO and range of other polar and non-polar materials using x-ray absorption near-edge spec-troscopy (XANES) in external electric fields [1]. A rigid band shift by a few meV/kV is found which scales linear with the applied field thus being reminiscent of the linear Stark-effect. This is corroborated by the consistent presence of this effect in polar thin films and bulk crystals and its absencein non-polar materials as well as in conducting films. The observed rigid band shift is isotropic andscales linear with the atomic number of the studied element. Therefore, XANES in electrical fields opens the perspective to study atomic polarization with element specificity in a range of functional materials.
[1] V. Ney, F. Wilhelm, K. Ollefs, A. Rogalev, and A. Ney, Phys. Rev. B 93, 035136 (2016)