Impact of atomic defects in the electronic states of FeSe$_{1-x}$S$_{x}$ superconducting crystals

Mar 15, 2023
2:00 PM - 3:00 PM
Prof. Dr. Yanina Fasano
Low Temperatures Lab & Instituto Balseiro, Centro Atómico Bariloche, Argentina
Main Topic
Rita Taubert
The electronic properties of Fe-based superconductors are drastically affected by deformations on their crystal structure introduced by doping and pressure. Here we study single crystals of FeSe1-xSx and reveal that local crystal deformations such as atomic-scale defects impact the spectral shape of the electronic core level states of the material. By means of scanning tunnelling microscopy (STM) we image S-doping induced defects as well as diluted dumbbell defects associated with Fe vacancies. We have access to the electronic structure of the samples by means of X-ray photoemission spectroscopy (XPS) and show that the spectral shape of the Se core levels can only be adequately described by considering a principal plus a minor component of the electronic states. We find this result for both pure and S-doped samples, irrespective that in the latter case the material presents extra crystal defects associated to doping with S atoms. We argue that the second component in our XPS spectra is associated with the ubiquitous dumbbell defects in FeSe that are known to entail a significant modification of the electronic clouds of surrounding atoms. We further support these findings by means of DFT calculations.

Last modified: Mar 15, 2023, 7:36:18 AM


Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (B3E.26, IFW Dresden)Helmholtzstraße2001069Dresden


Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
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