# Charge order and three-site distortions in the Verwey structure of magnetite

@article{Senn2012ChargeOA,
title={Charge order and three-site distortions in the Verwey structure of magnetite},
author={Mark S. Senn and Jon P. Wright and John Paul Attfield},
journal={Nature},
year={2012},
volume={481},
pages={173-176}
}
• Published 12 January 2012
• Physics
• Nature
The mineral magnetite (Fe3O4) undergoes a complex structural distortion and becomes electrically insulating at temperatures less than 125 kelvin. Verwey proposed in 1939 that this transition is driven by a charge ordering of Fe2+ and Fe3+ ions, but the ground state of the low-temperature phase has remained contentious because twinning of crystal domains hampers diffraction studies of the structure. Recent powder diffraction refinements and resonant X-ray studies have led to proposals of a…
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Magnetite (Fe3O4) is the original magnetic material and the parent of ferrite magnets, with modern applications ranging from spintronics to MRI contrast agents. At ambient temperatures magnetite has
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Jahn-Teller distortion driven magnetic polarons in magnetite
• Physics
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• 2017
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## References

SHOWING 1-10 OF 38 REFERENCES
Charge ordered structure of magnetite Fe 3 O 4 below the Verwey transition
• Materials Science
• 2002
The crystal structure of highly stoichiometric magnetite (Fe 3 O 4 ) below the Verwey transition has been refined from high-resolution neutron and synchrotron x-ray powder-diffraction data. The
Structural transformation in magnetite below the Verwey transition
• Physics
• 2011
The magnetite structure was studied with synchrotron x-ray powder diffraction above and below the Verwey transition. A symmetry-mode analysis was performed to obtain the atomic displacements from the
Long range charge ordering in magnetite below the Verwey transition.
• Chemistry, Physics
Physical review letters
• 2001
The crystal structure of Fe(3)O(4) below the 122 K Verwey transition has been refined using high-resolution x-ray and neutron powder diffraction data. The refinements give direct evidence for charge
Low-temperature structure of magnetite studied using resonant x-ray scattering
• Physics
• 2008
We propose a model for the Fe atomic displacements in the low-temperature phase of magnetite Fe3O4 , based on the analysis of the photon energy dependence of the scattered intensity of selected
Ferroelectricity from iron valence ordering in the charge-frustrated system LuFe2O4
• Physics
Nature
• 2005
Experimental evidence for ferroelectricity arising from electron correlations in the triangular mixed valence oxide, LuFe2O4 is reported, and resonant X-ray scattering measurements are used to determine the ordering of the Fe2+ and Fe3+ ions.
Full polarization analysis of resonant superlattice and forbidden x-ray reflections in magnetite.
• Physics
Journal of physics. Condensed matter : an Institute of Physics journal
• 2009
Through simulation of the resonant spectra it is confirmed that a degree of charge ordering takes place, while the anisotropic tensor of susceptibility scattering is responsible for the superlattice reflections below the Verwey transition.
Charge and orbital correlations at and above the Verwey phase transition in magnetite.
• Physics
Physical review letters
• 2008
The subtle interplay among electronic degrees of freedom (charge and orbital orderings), spin and lattice distortion that conspire at the Verwey transition in magnetite (Fe3O4) is still a matter of
Resonant x-ray diffraction study of the charge ordering in magnetite
• Physics, Geology
• 2005
Powder x-ray diffraction patterns of magnetite (Fe3O4) have been recorded at 90 K, below the Verwey transition, at three wavelengths in the pre- to mid-edge region of the 7.1 keV Fe K absorption.
Charge-orbital ordering and Verwey transition in magnetite.
• Physics
Physical review letters
• 2004
Local density approximation + Hubbard U (LDA + U) band structure calculations reveal that magnetite (Fe3O4) forms an insulating charge-orbital-ordered state below the Verwey transition temperature, and finds an associated t(2g) orbital ordering on the octahedral Fe2+ sublattice.
Aspects of the Verwey transition in magnetite
• Materials Science
• 2002
A mechanism of the Verwey transition in magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4}),$ which has been argued to be a charge ordering transition so far, is proposed. Based on mean-field calculations