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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunnelling and Josephson Junctions

TT 55.2: Vortrag

Donnerstag, 19. März 2020, 10:00–10:15, HSZ 204

Josephson Tunneling through Magnetic and Non-Magnetic Impurities — •Christian Ast¹, Haonan Huang¹, Jacob Senkpiel¹, Robert Drost¹, Juan Carlos Cuevas², Alfredo Levy Yeyati², Ciprian Padurariu³, Björn Kubala³, Joachim Ankerhold³, and Klaus Kern^1,4 — ¹MPI für Festkörperforschung, Stuttgart — ²Universidad Autónoma de Madrid, Spain — ³Universität Ulm — ⁴EPFL, Lausanne, Switzerland

The Josephson effect describes the tunneling of Cooper pairs between two coupled superconductors. The critical current, which is the characteristic coupling parameter of a Josephson junction, carries valuable information about the coupled superconductors as well as the properties of the tunnel junction itself, such as the symmetry of the order parameters or the presence of magnetic impurities in the tunnel junction. We employ scanning tunneling microscopy (STM) to study the local properties of Josephson junctions in the presence of magnetic and non-magnetic impurities. We find that the critical current is reduced, depending on the coupling strength of the magnetic impurity to the superconducting substrate, which is extracted from the energy of the induced Yu-Shiba-Rusinov state. We further discuss the impact of non-magnetic impurities on the critical current.