The effect of iron spin transition on electrical conductivity of (Mg,Fe)O magnesiowüstite

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概要

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• We measured the electrical conductivity of Mg0.81Fe0.19O magnesiowüstite, one of the important minerals comprising Earths lower mantle, at high pressures up to 135 GPa and 300 K in a diamond-anvil cell (DAC). The results demonstrate that the electrical conductivity increases with increasing pressure to about 60 GPa and exhibits anomalous behavior at higher pressures; it conversely decreases to around 80 GPa and again increases very mildly with pressure. These observed changes may be explained by the high-spin to low-spin transition of iron in magnesiowüstite that was previously reported to occur in a similar pressure range. A very small pressure effect on the electrical conductivity above 80 GPa suggests that a dominant conduction mechanism changes by this electronic spin transition. The electrical conductivity below 2000-km depth in the mantle may be much smaller than previously thought, since the spin transition takes place also in (Mg,Fe)SiO3 perovskite. (Communicated by Ikuo KUSHIRO, M.J.A.)

• 日本学士院の論文

著者

• OHTA Kenji

  Department of Electronics Engineering, Chubu University

• Ohta Kenji

  Department Of Electronics Engineering Chubu University

• HIROSE Kei

  Department of Earth and Planetary Sciences, Tokyo Institute of Technology

• ONODA Suzue

  Center for Quantum Science and Technology under Extreme Conditions, Osaka University

• SHIMIZU Katsuya

  Center for Quantum Science and Technology under Extreme Conditions, Osaka University

• Ohta Kenji

  Department Of Electronic Information Chubu University

• OHTA Kenji

  Department of Earth and Planetary Sciences, Tokyo Institute of Technology

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