Charge order in LuFe2O4: an unlikely route to ferroelectricity

J. de Groot; T. Mueller; R. A. Rosenberg; D. J. Keavney; Z. Islam; J. -W. Kim; M. Angst

doi:10.1103/PhysRevLett.108.187601

Charge order in LuFe2O4: an unlikely route to ferroelectricity

Strongly Correlated Electrons 2012-05-04 v2

Authors: J. de Groot , T. Mueller , R. A. Rosenberg , D. J. Keavney , Z. Islam , J. -W. Kim , M. Angst

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Abstract

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.

Keywords

LuFe2O4 charge order ferroelectricity crystal structure refinement bond-valence-sum analysis x-ray magnetic circular dichroism charge-spin coupling

Cite

@article{arxiv.1112.0978,
  title  = {Charge order in LuFe2O4: an unlikely route to ferroelectricity},
  author = {J. de Groot and T. Mueller and R. A. Rosenberg and D. J. Keavney and Z. Islam and J. -W. Kim and M. Angst},
  journal= {arXiv preprint arXiv:1112.0978},
  year   = {2012}
}

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5 pages, 3 figures

Charge order in LuFe2O4: an unlikely route to ferroelectricity

Abstract

Keywords

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