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@ARTICLE{deGroot:21209,
      author       = {de Groot, J. and Müller, T. and Rosenberg, R. A. and
                      Keavney, D. J. and Islam, Z. and Kim, J.-W. and Angst, M.},
      title        = {{C}harge {O}rder in {L}u{F}e2{O}4: {A}n {U}nlikely {R}oute
                      to {F}erroelectricity},
      journal      = {Physical review letters},
      volume       = {108},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-21209},
      pages        = {187601},
      year         = {2012},
      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.},
      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.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JARA-FIT / JCNS-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien
                      (FUEK412) / 544 - In-house Research with PNI (POF2-544)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-HGF)POF2-544},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000303384400013},
      doi          = {10.1103/PhysRevLett.108.187601},
      url          = {https://juser.fz-juelich.de/record/21209},
}