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Critical Current Densities through Josephson Junctions in Low Magnetic Fields

Din, Brad and Blair, Alexander and Schoofs, Frank and Hampshire, Damian (2022) 'Critical Current Densities through Josephson Junctions in Low Magnetic Fields.', IEEE Transactions on Applied Superconductivity, 32 (4). p. 8000805.


Understanding the properties of grain boundaries in polycrystalline superconductors is essential for optimizing their critical current density. Here, we provide computational simulations of 2D Josephson junctions (JJs) in low magnetic fields using time-dependent Ginzburg-Landau theory, since they can be considered a proxy for a grain boundary between two grains. We present data for junctions with a wide range of superconducting electrodes of different Ginzburg-Landau parameter () values and geometries, as well as normal barriers with different strengths of pair-breaking - characterized by the thickness of the junction and the junction condensation parameter (n) We describe our results using analytic solutions, and hence provide a detailed description of Josephson junctions in low fields up to that required for a single fluxon to penetrate the junction.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Date accepted:28 January 2022
Date deposited:11 March 2022
Date of first online publication:07 March 2022
Date first made open access:11 March 2022

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