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Local magnetic moments in iron and nickel at ambient and Earth’s core conditions
Some Bravais lattices have a particular geometry that can slow down the motion of Bloch electrons by pre-localization due to the band-structure properties. Another known source of electronic localization in solids is the Coulomb repulsion in partially filled d or f orbitals, which leads to the forma...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5510222/ https://www.ncbi.nlm.nih.gov/pubmed/28799538 http://dx.doi.org/10.1038/ncomms16062 |
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author | Hausoel, A. Karolak, M. Şaşιoğlu, E. Lichtenstein, A. Held, K. Katanin, A. Toschi, A. Sangiovanni, G. |
author_facet | Hausoel, A. Karolak, M. Şaşιoğlu, E. Lichtenstein, A. Held, K. Katanin, A. Toschi, A. Sangiovanni, G. |
author_sort | Hausoel, A. |
collection | PubMed |
description | Some Bravais lattices have a particular geometry that can slow down the motion of Bloch electrons by pre-localization due to the band-structure properties. Another known source of electronic localization in solids is the Coulomb repulsion in partially filled d or f orbitals, which leads to the formation of local magnetic moments. The combination of these two effects is usually considered of little relevance to strongly correlated materials. Here we show that it represents, instead, the underlying physical mechanism in two of the most important ferromagnets: nickel and iron. In nickel, the van Hove singularity has an unexpected impact on the magnetism. As a result, the electron–electron scattering rate is linear in temperature, in violation of the conventional Landau theory of metals. This is true even at Earth’s core pressures, at which iron is instead a good Fermi liquid. The importance of nickel in models of geomagnetism may have therefore to be reconsidered. |
format | Online Article Text |
id | pubmed-5510222 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-55102222017-08-15 Local magnetic moments in iron and nickel at ambient and Earth’s core conditions Hausoel, A. Karolak, M. Şaşιoğlu, E. Lichtenstein, A. Held, K. Katanin, A. Toschi, A. Sangiovanni, G. Nat Commun Article Some Bravais lattices have a particular geometry that can slow down the motion of Bloch electrons by pre-localization due to the band-structure properties. Another known source of electronic localization in solids is the Coulomb repulsion in partially filled d or f orbitals, which leads to the formation of local magnetic moments. The combination of these two effects is usually considered of little relevance to strongly correlated materials. Here we show that it represents, instead, the underlying physical mechanism in two of the most important ferromagnets: nickel and iron. In nickel, the van Hove singularity has an unexpected impact on the magnetism. As a result, the electron–electron scattering rate is linear in temperature, in violation of the conventional Landau theory of metals. This is true even at Earth’s core pressures, at which iron is instead a good Fermi liquid. The importance of nickel in models of geomagnetism may have therefore to be reconsidered. Nature Publishing Group 2017-07-12 /pmc/articles/PMC5510222/ /pubmed/28799538 http://dx.doi.org/10.1038/ncomms16062 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ 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 Hausoel, A. Karolak, M. Şaşιoğlu, E. Lichtenstein, A. Held, K. Katanin, A. Toschi, A. Sangiovanni, G. Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title | Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title_full | Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title_fullStr | Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title_full_unstemmed | Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title_short | Local magnetic moments in iron and nickel at ambient and Earth’s core conditions |
title_sort | local magnetic moments in iron and nickel at ambient and earth’s core conditions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5510222/ https://www.ncbi.nlm.nih.gov/pubmed/28799538 http://dx.doi.org/10.1038/ncomms16062 |
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