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Modeling the critical current of polycrystalline superconducting films in high magnetic fields.

Blair, Alexander and Hampshire, Damian (2019) 'Modeling the critical current of polycrystalline superconducting films in high magnetic fields.', IEEE transactions on applied superconductivity., 29 (5). p. 8001705.


We have performed simulations using time-dependent Ginzburg–Landau theory on a two-dimensional (2-D) polycrystalline system, where grain boundaries are modeled as narrow regions with a locally reduced critical temperature ( T c ). For the small system sizes investigated, we find that the critical current density ( J c ) is not sensitive to changes in grain size until the grain size is sufficiently small that it limits the average superparticle density in the system through the proximity effect. Furthermore, once T c in the boundary regions is sufficiently low relative to the surrounding superconductor that grain boundary regions act as preferred channels for flux flow, further reductions in the boundary T c only weakly reduce J c across the superconductor.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:© 2019 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:09 January 2019
Date deposited:01 March 2019
Date of first online publication:24 January 2019
Date first made open access:01 March 2019

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