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Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor

We performed magnetization measurements in a single crystal of the anisotropic bilayer pnictide superconductor KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] , with [Formula: see text] [Formula: see text] 34 K, for [Formula: see text] [Formula: see text] [For...

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Autores principales: Lopes, P. V., Sundar, Shyam, Salem-Sugui, S., Hong, Wenshan, Luo, Huiqian, Ghivelder, L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9701793/
https://www.ncbi.nlm.nih.gov/pubmed/36437284
http://dx.doi.org/10.1038/s41598-022-24012-z
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author Lopes, P. V.
Sundar, Shyam
Salem-Sugui, S.
Hong, Wenshan
Luo, Huiqian
Ghivelder, L.
author_facet Lopes, P. V.
Sundar, Shyam
Salem-Sugui, S.
Hong, Wenshan
Luo, Huiqian
Ghivelder, L.
author_sort Lopes, P. V.
collection PubMed
description We performed magnetization measurements in a single crystal of the anisotropic bilayer pnictide superconductor KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] , with [Formula: see text] [Formula: see text] 34 K, for [Formula: see text] [Formula: see text] [Formula: see text] -axis and [Formula: see text] [Formula: see text] [Formula: see text] -planes. A second magnetization peak (SMP) was observed in the isothermal M(H) curves measured below 16 K for [Formula: see text] [Formula: see text] [Formula: see text] -planes. A peak in the temperature variation of the critical current density, [Formula: see text] (T), at 16 K, strongly suggests the emergence of Josephson vortices at lower temperatures, which leads to the SMP in the sample. In addition, it is noticed that the appearance of Josephson vortices below 16 K renders easy magnetic flux penetration. A detailed vortex dynamics study suggests that the SMP can be explained in terms of elastic pinning to plastic pinning crossover. Furthermore, contrary to the common understanding, the temperature variation of the first peak field, [Formula: see text] , below and above 16 K, behaves non-monotonically. A highly disordered vortex phase, governed by plastic pinning, has been observed between 17 and 23 K, within a field region around an extremely large first peak field. Pinning force scaling suggests that the point defects are the dominant source of pinning for H [Formula: see text] [Formula: see text] -planes, whereas, for H [Formula: see text] [Formula: see text] -axis, point defects in addition to surface defects are at play. Such disorder contributes to the pinning due to the variation in charge carrier mean free path, [Formula: see text] -pinning. Moreover, the large [Formula: see text] observed in our study is consistent with the literature, which advocates this material for high magnetic field applications.
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spelling pubmed-97017932022-11-29 Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor Lopes, P. V. Sundar, Shyam Salem-Sugui, S. Hong, Wenshan Luo, Huiqian Ghivelder, L. Sci Rep Article We performed magnetization measurements in a single crystal of the anisotropic bilayer pnictide superconductor KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] , with [Formula: see text] [Formula: see text] 34 K, for [Formula: see text] [Formula: see text] [Formula: see text] -axis and [Formula: see text] [Formula: see text] [Formula: see text] -planes. A second magnetization peak (SMP) was observed in the isothermal M(H) curves measured below 16 K for [Formula: see text] [Formula: see text] [Formula: see text] -planes. A peak in the temperature variation of the critical current density, [Formula: see text] (T), at 16 K, strongly suggests the emergence of Josephson vortices at lower temperatures, which leads to the SMP in the sample. In addition, it is noticed that the appearance of Josephson vortices below 16 K renders easy magnetic flux penetration. A detailed vortex dynamics study suggests that the SMP can be explained in terms of elastic pinning to plastic pinning crossover. Furthermore, contrary to the common understanding, the temperature variation of the first peak field, [Formula: see text] , below and above 16 K, behaves non-monotonically. A highly disordered vortex phase, governed by plastic pinning, has been observed between 17 and 23 K, within a field region around an extremely large first peak field. Pinning force scaling suggests that the point defects are the dominant source of pinning for H [Formula: see text] [Formula: see text] -planes, whereas, for H [Formula: see text] [Formula: see text] -axis, point defects in addition to surface defects are at play. Such disorder contributes to the pinning due to the variation in charge carrier mean free path, [Formula: see text] -pinning. Moreover, the large [Formula: see text] observed in our study is consistent with the literature, which advocates this material for high magnetic field applications. Nature Publishing Group UK 2022-11-27 /pmc/articles/PMC9701793/ /pubmed/36437284 http://dx.doi.org/10.1038/s41598-022-24012-z Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Lopes, P. V.
Sundar, Shyam
Salem-Sugui, S.
Hong, Wenshan
Luo, Huiqian
Ghivelder, L.
Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title_full Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title_fullStr Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title_full_unstemmed Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title_short Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa[Formula: see text] Fe[Formula: see text] As[Formula: see text] F[Formula: see text] bilayer pnictide superconductor
title_sort second magnetization peak, anomalous field penetration, and josephson vortices in kca[formula: see text] fe[formula: see text] as[formula: see text] f[formula: see text] bilayer pnictide superconductor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9701793/
https://www.ncbi.nlm.nih.gov/pubmed/36437284
http://dx.doi.org/10.1038/s41598-022-24012-z
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