Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 99: Superconductivity: (General) Theory 2
TT 99.8: Talk
Thursday, March 19, 2015, 17:00–17:15, H 2053
The fate of the superconducting gap close to two magnetic Shiba impurities — •Tobias Meng1,2, Silas Hoffman2, Jelena Klinovaja2, Pascal Simon3, and Daniel Loss2 — 1Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 3Laboratoire de Physique des Solides, CNRS UMR-8502, Universite Paris Sud, 91405 Orsay Cedex, France
As a potential host for Majorana zero energy bound states, chains of magnetic impurities in superconductors are attracting an increasing amount of attention. Working towards a better understanding of the physics of such chains, we address the effect of a single, and of two close magnetic impurities in a superconductor. Specifically, we analytically calculate how the presence of the Cooper pair breaking Shiba impurities locally reduces the superconducting gap. We show that the gap renormalization can favor an antiferromagnetic ordering of the impurities that competes, e.g., with the RKKY exchange.