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O: Fachverband Oberflächenphysik

O 99: Spins on surfaces at the atomic scale III

O 99.3: Vortrag

Freitag, 13. März 2026, 10:00–10:15, WILL/A317

Quantifying the interplay between atomic-scale magnetism and Josephson transport atom-by-atom — •Zhengyuan Liu, Sebastian Scherb, Manuel Steinbrecher, Nadine Hauptmann, and Alexander Khajetoorians — IMM, Radboud University Nijmegen, the Netherlands

Josephson transport can locally be affected by the presence of magnetic moments in the junction. For example, it was shown that the individual magnetic impurity, and the Yu-Shiba-Rusinov (YSR) excitations they induce in the superconductor can be used to induce a superconducting diode effect [1]. Furthermore, an intrinsic phase shift of π in its ground state can exhibit when a ferromagnetic layer with certain thickness is introduced in the Josephson junction, known as the π-junction [2]. Here, we study the effect of individual and coupled magnetic atoms on the Josephson transport between a superconducting tip and superconducting surface, using scanning tunneling microscopy. We study the evolution of the YSR states going from an individual impurity to a magnetic nanostructure. We correlate this evolution to changes in the Josephson junction properties locally, by using spatially-dependent I-V spectroscopy. We also review the local diode effect induces in these structures. [1] Trahms, M et al. Nature 615, 628*633 (2023). [2]Ryazanov et al. Phys. Rev. Lett. 86, 2427 (2001)

Keywords: Josephson junctions; Superconducting diode effect; Magnetism; Nanostructure