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MA: Fachverband Magnetismus

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

MA 20.2: Vortrag

Dienstag, 17. März 2020, 10:15–10:30, HSZ 04

Magnetic Impurities and Anisotropic Multiband Superconductors — •Tom Saunderson¹, Gábor Csire³, James Annett¹, Balázs Úfalussy², and Martin Gradhand¹ — ¹HH Wills Laboratory, University of Bristol, UK — ²Wigner Research Centre for Physics, PO Box 49, H-1525 Budapest, Hungary — ³Catalan Institute of Nanoscience and Nanotechnology (ICN2), Barcelona, Spain

Scanning tunnelling microscopy for superconductors has seen a flourish of activity in the last few years. It has become a powerful tool for determining the underlying fundamental properties of the gap structures in unconventional superconductors within the presence of impurities [1]. It has also been interesting to observe the pair-breaking effects that magnetic impurities have in conventional superconductors which lead to bound states [2]. Such states are even a possible source of Majorana Fermions [3]. We present the implementation of the Bogoliubov-de Gennes (BdG) equation into a Green‘s function (KKR) first principles method [4]. This method combines the full complexity of the underlying electronic structure and Fermi surface geometry with a simple phenomenological parametrisation for the superconductivity, whilst also being ideal to model impurities and interfaces. We present various test cases of simple superconductors in the presence of magnetic impurities, and assess the orbital character of the ensuing bound states.
[1] Ø. Fischer et al, Rev. Mod. Phys., 79, 353 (2007)
[2] B. W. Heinrich et al, Prog. Surf. Sci., 93, 1 (2018)
[3] S. Nadj-Perge et al, Science, 346, 1259327 (2014)
[4] T. G. Saunderson et al, arXiv:1911.04163