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Modeling the Critical Current of Polycrystalline Superconducting Films in High Magnetic Fields

Blair, Alexander; Hampshire, Damian

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Authors

Alexander Blair

Damian Hampshire



Abstract

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.

Citation

Blair, A., & Hampshire, D. (2019). Modeling the Critical Current of Polycrystalline Superconducting Films in High Magnetic Fields. IEEE Transactions on Applied Superconductivity, 29(5), Article 8001705. https://doi.org/10.1109/tasc.2019.2895213

Journal Article Type Article
Acceptance Date Jan 9, 2019
Online Publication Date Jan 24, 2019
Publication Date Aug 31, 2019
Deposit Date Mar 1, 2019
Publicly Available Date Mar 1, 2019
Journal IEEE Transactions on Applied Superconductivity
Print ISSN 1051-8223
Electronic ISSN 1558-2515
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 29
Issue 5
Article Number 8001705
DOI https://doi.org/10.1109/tasc.2019.2895213

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