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We report results on electronic transport properties of liquid Fe-S alloys atconditions of planetary cores, computed by first-principle techniques in theKubo-Greenwood formalism. We describe a combined effect of resistivitysaturation due to temperature, compression, and chemistry by comparing theelectron mean free path from the Drude response of optical conductivity to themean interatomic distance. At high compression and high sulfur concentrationthe Ioffe-Regel condition is satisfied, and the temperature coefficient ofresistivity changes sign from positive to negative. We show that this happensdue to a decrease of the $d$-density of states at the Fermi level in responseto thermal broadening.

physical review. b./physical review. b

Saturation and negative temperature coefficient of electrical  resistivity in liquid iron-sulfur alloys at high densities from first  principles calculations