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Electronic properties and magnetism of iron at the Earth's inner core conditions
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 11, 115130- p.Article in journal (Refereed) Published
Abstract [en]

We employ state-of-the-art ab initio simulations within the dynamical mean-field theory to study three likely phases of iron (hcp, fcc, and bcc) at the Earth's core conditions. We demonstrate that the correction to the electronic free energy due to correlations can be significant for the relative stability of the phases. The strongest effect is observed in bcc Fe, which shows a non-Fermi-liquid behavior, and where a Curie-Weiss behavior of the uniform susceptibility hints at a local magnetic moment still existing at 5800 K and 300 GPa. We predict that all three structures have sufficiently high magnetic susceptibility to stabilize the geodynamo.

Place, publisher, year, edition, pages
2013. Vol. 87, no 11, 115130- p.
Keyword [en]
Centered-Cubic Iron, Transition, Density, Alloy, Field, Fe
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-120530DOI: 10.1103/PhysRevB.87.115130ISI: 000316414700004Scopus ID: 2-s2.0-84875697331OAI: oai:DiVA.org:kth-120530DiVA: diva2:615631
Funder
Swedish eā€Science Research CenterSwedish Foundation for Strategic Research , 10-0026Swedish Research Council, 621-2011-4426
Note

QC 20130411

Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2017-12-06Bibliographically approved

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