Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 3
O 80.4: Vortrag
Freitag, 9. September 2022, 11:15–11:30, S051
Yu-Shiba-Rusinov states of Fe dimers on NbSe2 — •Lisa M. Rütten1, Eva Liebhaber1, Harald Schmid1, Gaël Reecht1, Kai Rossnagel2,3, Felix von Oppen1, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany — 3Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
Unpaired adatom spins on superconductors interact with the Cooper pairs of the substrate and induce Yu-Shiba-Rusinov (YSR) states inside the superconducting gap. These can be probed by scanning tunneling spectroscopy at the single-atom scale. 2H-NbSe2 is a superconducting, layered van der Waals material, where the YSR wave functions of magnetic impurities extend over several nanometers. This provides a wide range of adatom spacings over which their interaction is sufficiently strong to be potentially observed as a splitting in the tunneling spectra. In addition to superconductivity, 2H-NbSe2 hosts an incommensurate charge-density wave (CDW). The imposed variation of the local density of states leads to shifts in the energy of the YSR states and alters the spatial symmetry of YSR wave functions. Here, we arrange Fe atoms on 2H-NbSe2 using the tip of a scanning tunneling microscope and realize dimers with different spacings and symmetries. We investigate the influence of spacing and position with respect to the CDW on the interaction between the YSR states.