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MA: Fachverband Magnetismus
MA 13: PhD Focus Session: Symposium on Strange Bedfellows - Magnetism Meets Superconductivity" (joint session MA/AKjDPG) (joint session MA/TT)
MA 13.4: Talk
Thursday, September 30, 2021, 11:15–11:30, H5
Tuning the interaction between spins coupled to a superconductor on the atomic level — •Felix Küster1, Ana M. Montero2, Filipe S. M. Guimarães2, Sascha Brinker2, Samir Lounis2, Stuart S. P. Parkin1, and Paolo Sessi1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, Jülich, Germany
Magnetic impurities coupled to superconducting condensates induce sharp in-gap resonances, the so-called Yu-Shiba- Rusinov (YSR) states. By reducing the distance between impurities, YSR quasiparticles can interact, hybridize, and eventually form bands. Here, we scrutinize the behavior of 3d atoms coupled to niobium by scanning tunneling microscopy and spectroscopy. We demonstrate how the coupling between spins and a superconducting condensate hosting an anisotropic Fermi surface can be tuned by varying the direction and distance between the impurities. We verify the existence of long range coupling as well as the crossing through a quantum phase transition, providing a promising platform for the emergence of topological superconductivity.