Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 60: Magnetic Materials: Applications and Multielement Bulk Materials
MA 60.10: Vortrag
Freitag, 24. März 2017, 11:45–12:00, HSZ 101
Spin disorder resistivity of iron at the Earth's core conditions — •Vaclav Drchal1, Josef Kudrnovsky1, Ilja Turek2, David Wagenknecht2, and Sergii Khmelevskyi3 — 1Institute of Physics, Acad. Sci. Czech Rep., Praha, Czech Republic — 2Department of Condensed Matter Physics, Charles University, Praha, Czech Republic — 3Center for Computational Materials Science, Vienna University of Technology, Vienna, Austria
Using ab initio calculations and linear response theory, we study the spin-disorder resistivity (SDR) at the Earth's core conditions. The SDR is caused by the scattering of electrons on fluctuating local moments that are stabilized at high temperatures by the magnetic entropy. As an illustration we consider bcc iron. We find a relatively large SDR of order 25 μΩcm but its contribution to the total resisistivity including also phonons is strongly suppressed at high temperatures, leading thus to a large violation of the Matthiessen rule. We also briefly discuss the effects of non-magnetic impurities.