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Two mechanisms of Josephson phase shift generation by an Abrikosov vortex
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. State University, Russia.
Number of Authors: 32019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 17, article id 174511Article in journal (Refereed) Published
Abstract [en]

Abrikosov vortices contain magnetic fields and circulating currents that decay at a short range lambda similar to 100 nm. However, vortices can induce Josephson phase shifts at a long range r similar to mu m >> lambda. Mechanisms of this puzzling phenomenon are not clearly understood. Here we present a systematic study of vortex-induced phase shifts in planar Josephson junctions. We make two key observations: (i) The cutoff effect: Although vortex-induced phase shift is a long-range phenomenon, it is terminated by the junction and does not persist beyond it. (ii) A linear to superlinear crossover with a rapid upturn of the phase shift occurs upon approaching a vortex to a junction. The crossover occurs at a vortex junction distance comparable to the penetration depth. Together with theoretical and numerical analysis this allows unambiguous identification of two distinct and independent mechanisms. The short range r less than or similar to lambda mechanism is due to circulating vortex currents inside a superconducting electrode without involvement of magnetic fields. The long range r >> lambda mechanism is due to stray magnetic fields outside electrodes without circulating vortex currents. We argue that understanding of controlling parameters of vortex-induced Josephson phase shift can be used for development of novel compact cryoelectronic devices.

Place, publisher, year, edition, pages
2019. Vol. 100, no 17, article id 174511
Keywords [en]
Aharonov-Bohm effect, Josephson effect, Vortices in superconductors
National Category
Materials Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-176527DOI: 10.1103/PhysRevB.100.174511ISI: 000495946800006OAI: oai:DiVA.org:su-176527DiVA, id: diva2:1380503
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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Golod, TarasKrasnov, Vladimir M.
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