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O: Fachverband Oberflächenphysik

O 30: Poster Session - Surface Magnetism

O 30.2: Poster

Montag, 16. März 2020, 18:15–20:00, P1A

Yu-Shiba-Rusinov states of Manganese atoms on Vanadium — •Jennifer Hartfiel, Gaël Reecht, Martina Trahms, Rika Simon, 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 a V(110) surface and find a variety of YSR state energies. Vanadium is very reactive and therefore oxygen atoms assemble on the surface, causing reconstructions in the upmost layer [1]. This makes it difficult to investigate a possible adsorption-site dependence of the YSR energies. To obtain a more homogeneous surface structure we grow Ag islands of a few monolayers on top of the Vanadium, before depositing the Mn atoms. We find that the islands exhibit a preferential growth direction with a specific angle to the V lattice. The Ag is proximitized by the superconducting substrate, and we also observe YSR states for Mn on Ag/V. In both cases we are able to manipulate the Mn atoms with the STM tip, causing a change in the YSR state energies.
  [1] R. Koller et al., Surface Science 512 (2002).