Novel Pressure-Induced Magnetic Transition in Magnetite (Fe3O4)

Yang Ding, Daniel Haskel, Sergei G. Ovchinnikov, Yuan-Chieh Tseng, Yuri S. Orlov, Jonathan C. Lang, and Ho-kwang Mao
Phys. Rev. Lett. 100, 045508 – Published 1 February 2008

Abstract

Fe K-edge x-ray magnetic circular dichroism of magnetite (Fe3O4) powders was measured with synchrotron radiation under variable pressure and temperature conditions in diamond anvil cell. The magnetic dichroism was observed to decrease discontinuously by 50% between 12 and 16 GPa, independent of temperature. The magnetic transition is attributed to a high-spin to intermediate-spin transition of Fe2+ ions in the octahedral sites and could account for previously observed structural and electrical anomalies in magnetite at this pressure range. The interpretation of x-ray magnetic circular dichroism data is supported by x-ray emission spectroscopy and theoretical cluster calculations.

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  • Received 9 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.045508

©2008 American Physical Society

Authors & Affiliations

Yang Ding1,*, Daniel Haskel2, Sergei G. Ovchinnikov3,4, Yuan-Chieh Tseng2, Yuri S. Orlov4, Jonathan C. Lang2, and Ho-kwang Mao1,5,6

  • 1HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
  • 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, 660036 Krasnoyarsk, Russia
  • 4Siberian Federal University, Krasnoyarsk, 660041 Russia
  • 5Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA
  • 6HPCAT, Carnegie Institution of Washington, Building 434E, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

  • *yangding@aps.anl.gov

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Issue

Vol. 100, Iss. 4 — 1 February 2008

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