SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Yu-Shiba-Rusinov Systems
TT 8.6: Talk
Monday, March 27, 2023, 16:30–16:45, HSZ 103
Effect of Fe impurities on the superconducting state of Ir/Nb overlayer — •Bendegúz Nyári1,2, András Lászlóffy3, Krisztián Palotás3, László Szunyogh1,2, Levente Rózsa4, and Balázs Újfalussy3 — 1Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary — 2ELKH-BME Condensed Matter Physics Research Group, Hungary — 3Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungary — 4Department of Physics, University of Konstanz, Germany
Artificial magnetic chains on top of superconducting surfaces, where in the presence of large spin-orbit coupling or non-collinear magnetic states a topological gap can appear, are potential candidates to host Majorana edge states. Iridium as an overlayer on various metallic substrates appeared to be a good platform for the formation of spin-spiral states in magnetic overlayers and chains.
By solving the relativistic Bogoliubov–de Gennes equations, first we investigate the superconducting properties of 10 monolayers of Ir on top of Nb(110) surface. In the Ir layer we observe a strong reduction of the superconducting order parameter, but the gap just slightly decreases as compared to bulk Nb. Then the effect of Fe impurities on the superconducting state is studied in different setups. For a single Fe impurity we find a huge spatial extension of the Yu–Shiba–Rusinov states. Disordered Fe impurities modelled within the coherent-potential approximation in the dilute concentration limit seem to rapidly destroy the superconducting state of the Ir overlayer.