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Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets

Noncoplanar magnetic orders in magnetic metals give rise to an anomalous Hall effect of unconventional origin, which, by the spin Berry phase effect, is known as the topological Hall effect. This effect is pronounced in the low-temperature limit, where the fluctuation of spins is suppressed. In cont...

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Detalles Bibliográficos
Autores principales: Ishizuka, Hiroaki, Nagaosa, Naoto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5819897/
https://www.ncbi.nlm.nih.gov/pubmed/29487909
http://dx.doi.org/10.1126/sciadv.aap9962
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author Ishizuka, Hiroaki
Nagaosa, Naoto
author_facet Ishizuka, Hiroaki
Nagaosa, Naoto
author_sort Ishizuka, Hiroaki
collection PubMed
description Noncoplanar magnetic orders in magnetic metals give rise to an anomalous Hall effect of unconventional origin, which, by the spin Berry phase effect, is known as the topological Hall effect. This effect is pronounced in the low-temperature limit, where the fluctuation of spins is suppressed. In contrast, we here discuss that the fluctuating but locally correlated spins close to the phase boundary give rise to another anomalous Hall effect, that with the opposite sign to the topological Hall effect. Using the Born approximation, we show that the anomalous Hall effect is attributed to the skew scattering induced by the local correlation of spins. The relation of the scalar spin chirality to the skew scattering amplitude is given, and the explicit formula for the Hall conductivity is derived using a semiclassical Boltzmann transport theory. Our theory potentially accounts for the sign change of the anomalous Hall effect observed in chiral magnets in the vicinity of the phase boundary.
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spelling pubmed-58198972018-02-27 Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets Ishizuka, Hiroaki Nagaosa, Naoto Sci Adv Research Articles Noncoplanar magnetic orders in magnetic metals give rise to an anomalous Hall effect of unconventional origin, which, by the spin Berry phase effect, is known as the topological Hall effect. This effect is pronounced in the low-temperature limit, where the fluctuation of spins is suppressed. In contrast, we here discuss that the fluctuating but locally correlated spins close to the phase boundary give rise to another anomalous Hall effect, that with the opposite sign to the topological Hall effect. Using the Born approximation, we show that the anomalous Hall effect is attributed to the skew scattering induced by the local correlation of spins. The relation of the scalar spin chirality to the skew scattering amplitude is given, and the explicit formula for the Hall conductivity is derived using a semiclassical Boltzmann transport theory. Our theory potentially accounts for the sign change of the anomalous Hall effect observed in chiral magnets in the vicinity of the phase boundary. American Association for the Advancement of Science 2018-02-09 /pmc/articles/PMC5819897/ /pubmed/29487909 http://dx.doi.org/10.1126/sciadv.aap9962 Text en Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Ishizuka, Hiroaki
Nagaosa, Naoto
Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title_full Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title_fullStr Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title_full_unstemmed Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title_short Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets
title_sort spin chirality induced skew scattering and anomalous hall effect in chiral magnets
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5819897/
https://www.ncbi.nlm.nih.gov/pubmed/29487909
http://dx.doi.org/10.1126/sciadv.aap9962
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