SKM 2021 – scientific programme

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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.