Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 45: Poster Spins on Surfaces at the Atomic Scale

O 45.9: Poster

Tuesday, March 18, 2025, 18:00–20:00, P2

Hybridization of Yu-Shiba-Rusinov states in magnetic clusters on Pb(111) — •Katharina Biel, Bharti Mahendru, Werner M. J. van Weerdenburg, Lisa M. Rütten, and Katharina J. Franke — Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

The unpaired spin of a magnetic impurity on a superconducting substrate interacts with the Cooper pairs via potential and exchange scattering. This leads to local in-gap bound states, so-called Yu-Shiba-Rusinov (YSR) states. The hybridization of close-by atoms can be described by linear combinations of the YSR states [1,2].

We investigated self-assembled manganese (Mn) and iron (Fe) clusters on superconducting lead (Pb(111)) by scanning tunneling microscopy and spectroscopy. While the topography essentially shows featureless protrusions, the differential conductance maps reflect characteristic shapes of the YSR states. We employ a phenomenological hybridization model [3] to simulate the observed shapes. In particular, we show atomic configurations which lead to chiral YSR patterns.

[1] Ruby, M., et al., PRL 120, 156803 (2018); [2] Amann, S., et al., PRB 108, 195403 (2023); [3] Rütten, L., et al., ACS Nano 18, 30798 (2024)

Keywords: YSR-states; superconductivity; STM; STS