Charge Order in LuFe2O4: An Unlikely Route to Ferroelectricity

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

doi:10.1103/PhysRevLett.108.187601

Journal Article

Charge Order in LuFe2O4: An Unlikely Route to Ferroelectricity

de Groot, J.FZJ* ; Müller, T.FZJ* ; Rosenberg, R. A. ; Keavney, D. J. ; Islam, Z. ; Kim, J.-W. ; Angst, M.FZJ*

2012
APS College Park, Md.

Physical review letters 108, 187601 (2012) [10.1103/PhysRevLett.108.187601]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7471 doi:10.1103/PhysRevLett.108.187601

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 with 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 nonpolar bilayers are inconsistent with charge order based ferroelectricity.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: We gratefully acknowledge D. Robinson for help with collecting data. Support from the initiative and networking fund of the Helmholtz Association of German Research Centers by funding the Helmholz-University Young Investigator Group "Complex Ordering Phenomena in Multifunctional Oxides," is gratefully acknowledged. Use of the Advance Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. M. A. thanks D. Mandrus, B. C. Sales, W. Tian, and R. Jin for their assistance in crystal growth, also supported by the U.S. DOE.

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Appears in the scientific report 2012

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Medline