Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Superconductivity: Poster Session
TT 21.35: Poster
Montag, 16. März 2015, 15:00–18:00, Poster B
Josephson Currents in a Weak-Link Superconductor-Ferromagnet Proximity Structure — •Jan Gelhausen1 and Matthias Eschrig2 — 1Royal Holloway, University of London, United Kingdom, Universität zu Köln — 2Royal Holloway, University of London, United Kingdom
We provide theoretical support for experimental measurements on a weak-link hybrid structure consisting of superconducting elements that are influenced by a ferromagnet (SSFS). It consists of a thin Aluminium wire that runs across a ferromagnetic disc made out of Nickel. The experimentally measured phase diagram allows for an identification of several temperature dependent system states. We numerically calculate important physical observables such as the local density of states, singlet and triplet pair amplitudes, proximity induced minigaps and their scaling behaviour with the system size, spin-magnetisations and the phase and temperature dependence of Josephson currents. The current-phase relationship of the SSFS junction is multivalued for low temperatures and approaches a sinusoidal form for increasing temperatures. This behaviour is indicative of a crossover from a Josephson-like behaviour to a junction that is dominated by a depairing current for decreasing temperatures.