Long Range Charge Ordering in Magnetite Below the Verwey Transition

Details Long Range Charge Ordering in Magnetite Below the Verwey Transition Long Range Charge Ordering in Magnetite Below the Verwey Transition

2001-11-07

arxiv.org/abs/cond-mat/0111119v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures, to be published in PRL

Scientific paper

10.1103/PhysRevLett.87.266401

The crystal structure of Fe3O4 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 ordering (CO) over four independent octahedral Fe sites, two with a charge of +2.4 and the other two of +2.6. CO schemes consistent with our model do not meet the widely-accepted Anderson condition of minimum electrostatic repulsion. Instead we propose that CO is driven primarily by a [001] electronic instability, which opens a gap at the transition through a charge density wave mechanism.

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