SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Posters Magnetism I

MA 3.1: Poster

Montag, 27. September 2021, 13:30–16:30, P

Yu-Shiba-Rusinov states of Manganese atoms on proximitzed Silver layers — •Jennifer Hartfiel, Mira Kressler, Gaël Recht, and Katharina J. Franke — Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

The adsorption of a magnetic adatom on a superconducting substrate perturbes the Cooper pair condensate in close proximity to the surface. The unpaired magnetic moment induces localized bound states, so-called Yu-Shiba-Rusinov (YSR) states, inside the superconducting energy gap, which can be probed by scanning tunneling spectroscopy (STS). The coupling strength between the magnetic moment of the impurity and the Cooper pairs determines the energy needed for tunneling into the YSR state.

In this work we perform STS measurements on Mn adatoms on Ag islands on Vanadium. Vanadium is very reactive and widely reconstructed by oxygen on the surface. This makes it difficult to investigate a possible adsorption-site dependence of the YSR energies. We passivate the surface by expitaxially grown silver monolayers. The Ag is proximitized by the superconducting substrate, and we observe YSR states for Mn on Ag/V. As the coupling of the magnetic impurity with the superconductor depends strongly on the adsorption geometry, we compare the YSR states for Mn atoms on two different crystal orientations of the Vanadium, which influences the structure of the Ag islands grown on top and, hence, the YSR states.