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Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor
We studied a method of measuring upper critical field (H(c2)) of a superconductor based on a width of ΔH = ΔB region, which appears in a superconductor that volume defects are many and dominant. Here we show basic concepts and details of the method. Although H(c2) of a superconductor is fixed accord...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7096532/ https://www.ncbi.nlm.nih.gov/pubmed/32214124 http://dx.doi.org/10.1038/s41598-020-61905-3 |
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author | Lee, H. B. Kim, G. C. Kim, Byeong-Joo Kim, Y. C. |
author_facet | Lee, H. B. Kim, G. C. Kim, Byeong-Joo Kim, Y. C. |
author_sort | Lee, H. B. |
collection | PubMed |
description | We studied a method of measuring upper critical field (H(c2)) of a superconductor based on a width of ΔH = ΔB region, which appears in a superconductor that volume defects are many and dominant. Here we show basic concepts and details of the method. Although H(c2) of a superconductor is fixed according to a kind of superconductor, it is difficult to measure H(c2) experimentally. Thus, results are different depending on experimental conditions. H(c2) was otained by a theory on a width of ΔH = ΔB region, which is that pinned fluxes at volume defects are picked out and move into an inside of the superconductor when the distance between pinned fluxes is the same as that at H(c2) of the superconductor. H(c2) of MgB(2) obtained by the method was 65.4 Tesla at 0 K, which is quite same as that of Ginzburg-Landau theory. The reason that H(c2) obtained by the method is closer to ultimate H(c2) is based on that F(pinning)/F(pickout) is more than 4 when pinned fluxes at volume defects of 163 nm radius are depinned, which means that the H(c2) is less sensitive to fluctuation. The method will help to find the ultimate H(c2) of volume defect-dominating superconductors. |
format | Online Article Text |
id | pubmed-7096532 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-70965322020-03-30 Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor Lee, H. B. Kim, G. C. Kim, Byeong-Joo Kim, Y. C. Sci Rep Article We studied a method of measuring upper critical field (H(c2)) of a superconductor based on a width of ΔH = ΔB region, which appears in a superconductor that volume defects are many and dominant. Here we show basic concepts and details of the method. Although H(c2) of a superconductor is fixed according to a kind of superconductor, it is difficult to measure H(c2) experimentally. Thus, results are different depending on experimental conditions. H(c2) was otained by a theory on a width of ΔH = ΔB region, which is that pinned fluxes at volume defects are picked out and move into an inside of the superconductor when the distance between pinned fluxes is the same as that at H(c2) of the superconductor. H(c2) of MgB(2) obtained by the method was 65.4 Tesla at 0 K, which is quite same as that of Ginzburg-Landau theory. The reason that H(c2) obtained by the method is closer to ultimate H(c2) is based on that F(pinning)/F(pickout) is more than 4 when pinned fluxes at volume defects of 163 nm radius are depinned, which means that the H(c2) is less sensitive to fluctuation. The method will help to find the ultimate H(c2) of volume defect-dominating superconductors. Nature Publishing Group UK 2020-03-25 /pmc/articles/PMC7096532/ /pubmed/32214124 http://dx.doi.org/10.1038/s41598-020-61905-3 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Lee, H. B. Kim, G. C. Kim, Byeong-Joo Kim, Y. C. Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title | Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title_full | Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title_fullStr | Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title_full_unstemmed | Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title_short | Upper Critical Field Based on a Width of ΔH = ΔB region in a Superconductor |
title_sort | upper critical field based on a width of δh = δb region in a superconductor |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7096532/ https://www.ncbi.nlm.nih.gov/pubmed/32214124 http://dx.doi.org/10.1038/s41598-020-61905-3 |
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