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Knowing the transport properties of iron under realistic conditions presentin the Earth's core is essential for the geophysical modeling of Earth'smagnetic field generation. Besides by extreme pressures and temperatures,transport may be influenced importantly also by the presence of light elements.Using a combination of molecular dynamics, density functional theory, anddynamical mean-field theory methods we investigate how oxygen impuritiesinfluence the electronic correlations and transport in the liquid outer Earth'score. We consider a case with an oxygen content of ~10 atomic%, a value that isbelieved to be close to the composition of the core. We find that theelectronic correlations are enhanced but their effect on conductivities ismoderate (compared to pure Fe, electrical conductivity drops by 10% and thermalconductivity by 18%). The effect of electron-electron scattering alone, whereasnot large, is comparable to effects of the compositional disorder. We revealthe mechanism behind the larger suppression of the thermal conductivity andassociated reduction of the Lorenz ratio and discuss its geophysicalsignificance.

Influence of oxygen on electronic correlation and transport in iron in the outer Earth's core