Long Range Charge Ordering in Magnetite Below the Verwey Transition

Preprint

13 November 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0111119

Abstract

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.

Keywords

CHARGE DENSITY WAVE
CRYSTAL STRUCTURE
VERWEY TRANSITION
CHARGE ORDERING
REFINEMENTS

All Related Versions

Version 1, 2001-11-07, ArXiv
Version 2, 2001-11-13, ArXiv
Published version: Physical Review Letters, 87 (26), 266401.

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