Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 20: PhD Focus Session: Symposium on SStrange Bedfellows – Magnetism Meets Superconductivity" (joint session MA/AKjDPG)

MA 20.4: Talk

Tuesday, March 17, 2020, 11:00–11:15, HSZ 04

Symmetric and antisymmetric combinations of Yu-Shiba-Rusinov states in antiferromagnetic dimers — •Philip Beck, Lucas Schneider, Levente Rósza, Jens Wiebe, and Roland Wiesendanger — Department of Physics, University of Hamburg, Jungiusstraße 9-11, 20355 Hamburg

Magnetic atoms coupled to the Cooper pairs of a superconductor give rise to excitations in the superconductor’s energy gap, so-called Yu-Shiba-Rusinov (YSR) states [1]. Theoretical proposals and experimental results have shown that, for ferromagnetically coupled atoms, the in-gap states hybridize and form symmetric and antisymmetric linear combinations.[2-4]
In our scanning tunneling spectroscopy study we reveal the evolution from multi-orbital YSR states of single transition metal atoms placed on an elemental superconductor to the YSR states of artificially constructed dimers with different interatomic separations and orientations. Even though the coupling in particular dimers, as calculated by DFT, is antiferromagnetic, we still observe a splitting of some of their orbital YSR states into symmetric and antisymmetric combinations. This unexpected behavior will be discussed and explained by advanced theoretical models.
We acknowledge funding by the ERC via the Advanced Grant ADMIRE (no. 786020) and by the SFB925 of the DFG.
[1] A. Rusinov, JETP 9, 85 (1969). [2] D. K. Morr et al. PRB 67, 020502 (2003). [3] M. Ruby et al. PRL 120, 156803 (2018). [4] D.-J. Choi et al. PRL 120, 167001 (2018).