Local magnetic moments in iron and nickel at ambient and Earth’s core conditions
| Autor: | Alexander I. Lichtenstein, Alessandro Toschi, M. Karolak, Karsten Held, E. Şaşιoğlu, Andreas Hausoel, Giorgio Sangiovanni, Andrey A. Katanin |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
inorganic chemicals
Magnetism Science Van Hove singularity FOS: Physical sciences General Physics and Astronomy Mineralogy chemistry.chemical_element 02 engineering and technology 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Physics::Geophysics Physics - Geophysics Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science 0103 physical sciences otorhinolaryngologic diseases ddc:530 010306 general physics Physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnetic moment General Chemistry 021001 nanoscience & nanotechnology equipment and supplies Geophysics (physics.geo-ph) Magnetic field Computer Science::Other Nickel Ferromagnetism chemistry Physics::Space Physics Strongly correlated material Condensed Matter::Strongly Correlated Electrons Fermi liquid theory 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. Comment: Supplementary Information available at https://www.nature.com/articles/ncomms16062#supplementary-information |
| Databáze: | OpenAIRE |
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