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We compute the thermal conductivity and electrical resistivity of solid hcpFe to pressures and temperatures of Earth's core. We find significantcontributions from electron-electron scattering, usually neglected at hightemperatures in transition metals. Our calculations show a quasi-linearrelation between electrical resistivity and temperature for hcp Fe at extremehigh pressures. We obtain thermal and electrical conductivities that areconsistent with experiments considering reasonable error. The predicted thermalconductivity is reduced from previous estimates that neglect electron-electronscattering. Our estimated thermal conductivity for the outer core is 77$\pm$10W/m/K, and is consistent with a geodynamo driven by thermal convection.

Thermal conductivity and electrical resistivity of solid iron at Earth's core conditions from first-principles