Measuring the Electrical Resistivity of Liquid Iron to 1.4 Mbar
Kenji Ohta, Sho Suehiro, Saori I. Kawaguchi, Y. Okuda, Tatsuya Wakamatsu, Kei Hirose, Yasuo Ohishi, Manabu Kodama, Shuichiro Hirai, Shintaro Azuma
Abstract
We determined the electrical resistivity of liquid Fe to 135 GPa and 6680 K using a four-probe method in a diamond-anvil cell combined with two novel techniques: (i) enclosing a molten Fe in a sapphire capsule, and (ii) millisecond time-resolved simultaneous measurements of the resistance, x-ray diffraction, and temperature of instantaneously melted Fe. Our results show the minimal temperature dependence of the resistivity of liquid Fe and its anomalous resistivity decrease around 50 GPa, likely associated with a gradual magnetic transition, both in agreement with previous ab initio calculations.
Topics & Concepts
Electrical resistivity and conductivityDiamond anvil cellMaterials scienceSapphireDiffractionDiamondElectrical resistance and conductanceWarm dense matterAb initioCondensed matter physicsAnalytical Chemistry (journal)ElectronChemistryMetallurgyPhysicsComposite materialNuclear physicsOpticsLaserChromatographyOrganic chemistryQuantum mechanicsHigh-pressure geophysics and materialsRare-earth and actinide compoundsThermodynamic and Structural Properties of Metals and Alloys