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Nonlocal electron correlations in an itinerant ferromagnet
Our understanding of the properties of ferromagnetic materials, widely used in spintronic devices, is fundamentally based on their electronic band structure. However, even for the most simple elemental ferromagnets, electron correlations are prevalent, requiring descriptions of their electronic stru...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6137183/ https://www.ncbi.nlm.nih.gov/pubmed/30213929 http://dx.doi.org/10.1038/s41467-018-05960-5 |
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author | Tusche, Christian Ellguth, Martin Feyer, Vitaliy Krasyuk, Alexander Wiemann, Carsten Henk, Jürgen Schneider, Claus M. Kirschner, Jürgen |
author_facet | Tusche, Christian Ellguth, Martin Feyer, Vitaliy Krasyuk, Alexander Wiemann, Carsten Henk, Jürgen Schneider, Claus M. Kirschner, Jürgen |
author_sort | Tusche, Christian |
collection | PubMed |
description | Our understanding of the properties of ferromagnetic materials, widely used in spintronic devices, is fundamentally based on their electronic band structure. However, even for the most simple elemental ferromagnets, electron correlations are prevalent, requiring descriptions of their electronic structure beyond the simple picture of independent quasi-particles. Here, we give evidence that in itinerant ferromagnets like cobalt these electron correlations are of nonlocal origin, manifested in a complex self-energy Σ(σ)(E,k) that disperses as function of spin σ, energy E, and momentum vector k. Together with one-step photoemission calculations, our experiments allow us to quantify the dispersive behaviour of the complex self-energy over the whole Brillouin zone. At the same time we observe regions of anomalously large “waterfall”-like band renormalization, previously only attributed to strong electron correlations in high-T(C) superconductors, making itinerant ferromagnets a paradigmatic test case for the interplay between band structure, magnetism, and many-body correlations. |
format | Online Article Text |
id | pubmed-6137183 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-61371832018-09-17 Nonlocal electron correlations in an itinerant ferromagnet Tusche, Christian Ellguth, Martin Feyer, Vitaliy Krasyuk, Alexander Wiemann, Carsten Henk, Jürgen Schneider, Claus M. Kirschner, Jürgen Nat Commun Article Our understanding of the properties of ferromagnetic materials, widely used in spintronic devices, is fundamentally based on their electronic band structure. However, even for the most simple elemental ferromagnets, electron correlations are prevalent, requiring descriptions of their electronic structure beyond the simple picture of independent quasi-particles. Here, we give evidence that in itinerant ferromagnets like cobalt these electron correlations are of nonlocal origin, manifested in a complex self-energy Σ(σ)(E,k) that disperses as function of spin σ, energy E, and momentum vector k. Together with one-step photoemission calculations, our experiments allow us to quantify the dispersive behaviour of the complex self-energy over the whole Brillouin zone. At the same time we observe regions of anomalously large “waterfall”-like band renormalization, previously only attributed to strong electron correlations in high-T(C) superconductors, making itinerant ferromagnets a paradigmatic test case for the interplay between band structure, magnetism, and many-body correlations. Nature Publishing Group UK 2018-09-13 /pmc/articles/PMC6137183/ /pubmed/30213929 http://dx.doi.org/10.1038/s41467-018-05960-5 Text en © The Author(s) 2018 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 Tusche, Christian Ellguth, Martin Feyer, Vitaliy Krasyuk, Alexander Wiemann, Carsten Henk, Jürgen Schneider, Claus M. Kirschner, Jürgen Nonlocal electron correlations in an itinerant ferromagnet |
title | Nonlocal electron correlations in an itinerant ferromagnet |
title_full | Nonlocal electron correlations in an itinerant ferromagnet |
title_fullStr | Nonlocal electron correlations in an itinerant ferromagnet |
title_full_unstemmed | Nonlocal electron correlations in an itinerant ferromagnet |
title_short | Nonlocal electron correlations in an itinerant ferromagnet |
title_sort | nonlocal electron correlations in an itinerant ferromagnet |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6137183/ https://www.ncbi.nlm.nih.gov/pubmed/30213929 http://dx.doi.org/10.1038/s41467-018-05960-5 |
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