Local magnetic moments in iron and nickel at ambient and Earth's core conditions

Please always quote using this URN: urn:nbn:de:bvb:20-opus-170681
  • 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 importantSome 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.show moreshow less

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Metadaten
Author: A. Hausoel, M. Karolak, E. Şaşιoğlu, A. Lichtenstein, K. Held, A. Katanin, A. Toschi, G. Sangiovanni
URN:urn:nbn:de:bvb:20-opus-170681
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie / Institut für Theoretische Physik und Astrophysik
Language:English
Parent Title (English):Nature Communications
Year of Completion:2017
Volume:8
Issue:16062
Source:Nature Communications 2017, 8:16062. DOI: 10.1038/ncomms16062
DOI:https://doi.org/10.1038/ncomms16062
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=28799538
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Tag:electronic properties and materials; ferromagnetism; iron; magnetic properties and materials; nickel
Release Date:2019/10/02
EU-Project number / Contract (GA) number:306447
OpenAIRE:OpenAIRE
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International