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Evidence for isotropic s-wave superconductivity in high-entropy alloys
High-entropy alloys (HEA) form through the random arrangement of five or more chemical elements on a crystalline lattice. Despite the significant amount of resulting compositional disorder, a subset of HEAs enters a superconducting state below critical temperatures, [Formula: see text] K. The superc...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9329343/ https://www.ncbi.nlm.nih.gov/pubmed/35896621 http://dx.doi.org/10.1038/s41598-022-16355-4 |
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author | Leung, Casey K. W. Zhang, Xiaofu von Rohr, Fabian Lortz, Rolf Jäck, Berthold |
author_facet | Leung, Casey K. W. Zhang, Xiaofu von Rohr, Fabian Lortz, Rolf Jäck, Berthold |
author_sort | Leung, Casey K. W. |
collection | PubMed |
description | High-entropy alloys (HEA) form through the random arrangement of five or more chemical elements on a crystalline lattice. Despite the significant amount of resulting compositional disorder, a subset of HEAs enters a superconducting state below critical temperatures, [Formula: see text] K. The superconducting properties of the known HEAs seem to suffice a Bardeen–Cooper–Schrieffer (BCS) description, but little is known about their superconducting order parameter and the microscopic role of disorder. We report on magnetic susceptibility measurements on films of the superconducting HEA (TaNb)[Formula: see text] (ZrHfTi)[Formula: see text] for characterizing the lower and upper critical fields [Formula: see text] and [Formula: see text] , respectively as a function of temperature T. Our resulting analysis of the Ginzburg–Landau coherence length and penetration depth demonstrates that HEAs of this type are single-band isotropic s-wave superconductors in the dirty limit. Despite a significant difference in the elemental composition between the [Formula: see text] and [Formula: see text] films, we find that the observed [Formula: see text] variations cannot be explained by disorder effects. |
format | Online Article Text |
id | pubmed-9329343 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-93293432022-07-29 Evidence for isotropic s-wave superconductivity in high-entropy alloys Leung, Casey K. W. Zhang, Xiaofu von Rohr, Fabian Lortz, Rolf Jäck, Berthold Sci Rep Article High-entropy alloys (HEA) form through the random arrangement of five or more chemical elements on a crystalline lattice. Despite the significant amount of resulting compositional disorder, a subset of HEAs enters a superconducting state below critical temperatures, [Formula: see text] K. The superconducting properties of the known HEAs seem to suffice a Bardeen–Cooper–Schrieffer (BCS) description, but little is known about their superconducting order parameter and the microscopic role of disorder. We report on magnetic susceptibility measurements on films of the superconducting HEA (TaNb)[Formula: see text] (ZrHfTi)[Formula: see text] for characterizing the lower and upper critical fields [Formula: see text] and [Formula: see text] , respectively as a function of temperature T. Our resulting analysis of the Ginzburg–Landau coherence length and penetration depth demonstrates that HEAs of this type are single-band isotropic s-wave superconductors in the dirty limit. Despite a significant difference in the elemental composition between the [Formula: see text] and [Formula: see text] films, we find that the observed [Formula: see text] variations cannot be explained by disorder effects. Nature Publishing Group UK 2022-07-27 /pmc/articles/PMC9329343/ /pubmed/35896621 http://dx.doi.org/10.1038/s41598-022-16355-4 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 Leung, Casey K. W. Zhang, Xiaofu von Rohr, Fabian Lortz, Rolf Jäck, Berthold Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title | Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title_full | Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title_fullStr | Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title_full_unstemmed | Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title_short | Evidence for isotropic s-wave superconductivity in high-entropy alloys |
title_sort | evidence for isotropic s-wave superconductivity in high-entropy alloys |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9329343/ https://www.ncbi.nlm.nih.gov/pubmed/35896621 http://dx.doi.org/10.1038/s41598-022-16355-4 |
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