Modeling the Critical Current of Polycrystalline Superconducting Films in High Magnetic Fields
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 cur...
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| Veröffentlicht in: | IEEE transactions on applied superconductivity 2019-08, Vol.29 (5), p.1-5 |
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| creator | Blair, Alexander I. Hampshire, Damian P. |
| description | 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. |
| doi_str_mv | 10.1109/TASC.2019.2895213 |
| format | Article |
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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.</description><identifier>ISSN: 1051-8223</identifier><identifier>EISSN: 1558-2515</identifier><identifier>DOI: 10.1109/TASC.2019.2895213</identifier><identifier>CODEN: ITASE9</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Computer simulation ; Critical current density ; Critical current density (superconductivity) ; Critical temperature ; Electric fields ; Grain boundaries ; Grain size ; Josephson junctions ; junctions ; Magnetic fields ; Mathematical model ; Polycrystals ; Proximity effect (electricity) ; Superconducting films ; Superconducting magnets ; TDGL ; thin films ; Time dependence ; Two dimensional models</subject><ispartof>IEEE transactions on applied superconductivity, 2019-08, Vol.29 (5), p.1-5</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c336t-a34a600b8316795e9aef8e3492a40f4f1705455294fd5030323d04fe71662b33</citedby><cites>FETCH-LOGICAL-c336t-a34a600b8316795e9aef8e3492a40f4f1705455294fd5030323d04fe71662b33</cites><orcidid>0000-0002-4876-1007 ; 0000-0001-8552-8514</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/8625477$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,780,784,796,27923,27924,54757</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/8625477$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Blair, Alexander I.</creatorcontrib><creatorcontrib>Hampshire, Damian P.</creatorcontrib><title>Modeling the Critical Current of Polycrystalline Superconducting Films in High Magnetic Fields</title><title>IEEE transactions on applied superconductivity</title><addtitle>TASC</addtitle><description>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.</description><subject>Computer simulation</subject><subject>Critical current density</subject><subject>Critical current density (superconductivity)</subject><subject>Critical temperature</subject><subject>Electric fields</subject><subject>Grain boundaries</subject><subject>Grain size</subject><subject>Josephson junctions</subject><subject>junctions</subject><subject>Magnetic fields</subject><subject>Mathematical model</subject><subject>Polycrystals</subject><subject>Proximity effect (electricity)</subject><subject>Superconducting films</subject><subject>Superconducting magnets</subject><subject>TDGL</subject><subject>thin films</subject><subject>Time dependence</subject><subject>Two dimensional models</subject><issn>1051-8223</issn><issn>1558-2515</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kE1Lw0AQhhdRsFZ_gHhZ8Jy6sx_J5liCtUKLQnt22Saz7ZY0qbvJof_elBZPMwzP-w48hDwDmwCw_G09XRUTziCfcJ0rDuKGjEApnXAF6nbYmYJEcy7uyUOMe8ZAaqlG5GfZVlj7Zku7HdIi-M6XtqZFHwI2HW0d_W7rUxlOsbP1wCFd9UcMZdtUfdmdczNfHyL1DZ377Y4u7bbBoWM4Y13FR3LnbB3x6TrHZD17XxfzZPH18VlMF0kpRNolVkibMrbRAtIsV5hbdBqFzLmVzEkHGVNSKZ5LVykmmOCiYtJhBmnKN0KMyeul9hja3x5jZ_ZtH5rho-GgVSYEz2Cg4EKVoY0xoDPH4A82nAwwc7ZozhbN2aK5WhwyL5eMR8R_XqdcySwTfwcfbRc</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Blair, Alexander I.</creator><creator>Hampshire, Damian P.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | Computer simulation Critical current density Critical current density (superconductivity) Critical temperature Electric fields Grain boundaries Grain size Josephson junctions junctions Magnetic fields Mathematical model Polycrystals Proximity effect (electricity) Superconducting films Superconducting magnets TDGL thin films Time dependence Two dimensional models |
| title | Modeling the Critical Current of Polycrystalline Superconducting Films in High Magnetic Fields |
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