Alloy disorder and fluctuating magnetic moments in the Earth's core

0521048 - FZÚ 2020 RIV NL eng J - Článek v odborném periodiku
Drchal, Václav - Kudrnovský, Josef - Wagenknecht, D. - Turek, I.
Alloy disorder and fluctuating magnetic moments in the Earth's core.
Journal of Magnetism and Magnetic Materials. Roč. 475, Apr (2019), s. 767-771. ISSN 0304-8853. E-ISSN 1873-4766
Grant CEP: GA ČR GA18-07172S
Institucionální podpora: RVO:68378271
Klíčová slova: Earth's core * iron alloys * fluctuating moments * spin-disorder resistivity
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.717, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jmmm.2018.11.112

The electronic and thermal transport properties of the Earth’s core are crucial for many geophysical models. We show by first-principles modeling and methods of statistical physics that the spin disorder, not considered in previous studies, gives an essential contribution to the electrical resistivity at the Earth’s core conditions. The origin of this spin-disorder resistivity (SDR) consists in the existence of fluctuating local moments that are stabilized at high temperatures by the magnetic entropy even at pressures at which the ground state of iron is non-magnetic. It turns out that the contributions of various scattering mechanisms (alloy disorder, phonon scattering, spin disorder, and electron-electron correlations) are comparable, but not additive. Here we report results for iron and iron-rich alloys (Fe-O, Fe-Si, Fe-S) that can be present in the Earth’s core. Special attention is paid to alloys with two magnetic elements (Fe-Ni).
Trvalý link: http://hdl.handle.net/11104/0305705