 |
École polytechnique Open archive |  |
 |
Journal articles
Electronic correlations and transport in iron at Earth’s core conditions
Abstract : The transport properties of iron under Earth's inner core conditions are essential input for the geophysical modelling but are poorly constrained experimentally. Here we show that the thermal and electrical conductivity of iron at those conditions remains high even if the electron-electron-scattering (EES) is properly taken into account. This result is obtained by ab initio simulations taking into account consistently both thermal disorder and electronic correlations. Thermal disorder suppresses the non-Fermi-liquid behavior of the bodycentered cubic iron phase, hence, reducing the EES; the total calculated thermal conductivity of this phase is 220 Wm −1 K −1 with the EES reduction not exceeding 20%. The EES and electron-lattice scattering are intertwined resulting in breaking of the Matthiessen's rule with increasing EES. In the hexagonal close-packed iron the EES is also not increased by thermal disorder and remains weak. Our main finding thus holds for the both likely iron phases in the inner core.
https://hal-polytechnique.archives-ouvertes.fr/hal-03189010
Contributor : Leonid Pourovskii <>
Submitted on : Friday, April 2, 2021 - 4:17:51 PM
Last modification on : Wednesday, April 7, 2021 - 3:32:52 AM
Long-term archiving on: : Saturday, July 3, 2021 - 6:46:27 PM
Contributor : Leonid Pourovskii <>
Submitted on : Friday, April 2, 2021 - 4:17:51 PM
Last modification on : Wednesday, April 7, 2021 - 3:32:52 AM
Long-term archiving on: : Saturday, July 3, 2021 - 6:46:27 PM
File
s41467-020-18003-9.pdf
Publisher files allowed on an open archive