Charge order in LuFe2O4: an unlikely route to ferroelectricity

Details Charge order in LuFe2O4: an unlikely route to ferroelectricity Charge order in LuFe2O4: an unlikely route to ferroelectricity

2011-12-05

arxiv.org/abs/1112.0978v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

We present the refinement of the crystal structure of charge-ordered LuFe2O4, based on single-crystal x-ray diffraction data. The arrangement of the different Fe-valence states, determined with bond-valence-sum analysis, corresponds to a stacking of charged Fe bilayers, in contrast to the polar bilayers previously suggested. This arrangement is supported by an analysis of x-ray magnetic circular dichroism spectra, which also evidences a strong charge-spin coupling. The non-polar bilayers are inconsistent with charge order based ferroelectricity.

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