Electrical conductivity of the lower-mantle ferropericlase across the electronic spin transition

Details Electrical conductivity of the lower-mantle ferropericlase across the electronic spin transition Electrical conductivity of the lower-mantle ferropericlase across the electronic spin transition

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416305l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 16, CiteID L16305

Physics

17

Geodesy And Gravity: Earth'S Interior: Composition And State (7207, 7208, 8105, 8124), Geodesy And Gravity: Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), Mineral Physics: Creep And Deformation, Mineral Physics: Electrical Properties, Mineral Physics: Equations Of State

Scientific paper

Electrical conductivity of the lower-mantle ferropericlase-(Mg0.75,Fe0.25)O has been studied using designer diamond anvils to pressures over one megabar and temperatures up to 500 K. The electrical conductivity of (Mg0.75,Fe0.25)O gradually rises by an order of magnitude up to 50 GPa but decreases by a factor of approximately three between 50 to 70 GPa. This decrease in the electrical conductivity is attributed to the isosymmetric high-spin to low-spin transition of iron in ferropericlase. That is, the electronic spin transition of iron results in a decrease in the mobility and/or density of the charge transfer carriers in the low-spin ferropericlase. The activation energy of the low-spin ferropericlase is 0.27 eV at 101 GPa, consistent with the small polaron conduction (electronic hopping, charge transfer). Our results indicate that low-spin ferropericlase exhibits lower electrical conductivity than high-spin ferropericlase, which needs to be considered in future geomagnetic models for the lower mantle.

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