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Experimental and Theoretical Evidence for Pressure-Induced Metallization in FeO with Rocksalt-Type Structure

Kenji Ohta, R. E. Cohen, Kei Hirose, Kristjan Haule, Katsuya Shimizu, and Yasuo Ohishi
Phys. Rev. Lett. 108, 026403 – Published 12 January 2012
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Abstract

Electrical conductivity of FeO was measured up to 141 GPa and 2480 K in a laser-heated diamond-anvil cell. The results show that rock-salt (B1) type structured FeO metallizes at around 70 GPa and 1900 K without any structural phase transition. We computed fully self-consistently the electronic structure and the electrical conductivity of B1 FeO as a function of pressure and temperature, and found that although insulating as expected at ambient condition, B1 FeO metallizes at high temperatures, consistent with experiments. The observed metallization is related to spin crossover.

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  • Received 25 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.026403

© 2012 American Physical Society

Synopsis

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Lowered Resistance Under Pressure

Published 12 January 2012

Researchers have observed a new phase transition as the geophysically important mineral FeO becomes metallic when compressed in a diamond anvil cell.

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Authors & Affiliations

Kenji Ohta1,*, R. E. Cohen2,*, Kei Hirose3,4, Kristjan Haule5, Katsuya Shimizu1, and Yasuo Ohishi6

  • 1Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 2Geophysical Laboratory, Carnegie Institution of Washington, Washington D.C. 20015, USA
  • 3Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
  • 4Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan
  • 5Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA
  • 6Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan

  • *Corresponding authors. ohta@djebel.mp.es.osaka-u.ac.jp rcohen@ciw.edu

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Issue

Vol. 108, Iss. 2 — 13 January 2012

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