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@ARTICLE{Bland:11617,
      author       = {Bland, S.R. and Angst, M. and Adiga, S. and Scagnoli, V.
                      and Johnson, R.D. and Herrero-Martin, J. and Hatton, P.D.},
      title        = {{S}ymmetry and charge order in {F}e2{OBO}3 studied through
                      polarized resonant x-ray diffraction},
      journal      = {Physical review / B},
      volume       = {82},
      number       = {11},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-11617},
      pages        = {115110},
      year         = {2010},
      note         = {The authors wish to thank the ESRF for the beamtime and
                      experimental support. S.R.B., R.D.J., and P.D.H. thank EPSRC
                      and STFC for funding. M.A. and S.A. acknowledge support by
                      the Initiative and Networking Fund of the Helmholtz
                      Association of German Research Centers through the
                      Helmholtz-University Young Investigator Group Complex
                      Ordering Phenomena in Multifunctional Oxides and by the
                      institute of scattering methods. S.R.B. thanks Y. Joly for
                      helpful discussions and assistance with FDMNES, and C. B.
                      Buckley for additional experimental support. The authors
                      thank R. P. Hermann for preliminary measurements and helpful
                      EXAFS discussions and results. This work was partially
                      performed on the EPSRC-funded XMaS beamline at the ESRF,
                      directed by M. J. Cooper and C. A. Lucas. We are grateful to
                      the beamline team of S. D. Brown, P. Normile, O. Bikondoa,
                      L. Bouchenoire, and P. Thompson for their invaluable
                      assistance, and to S. Beaufoy and J. Kervin for additional
                      support.},
      abstract     = {Bond valence sum calculations have previously suggested
                      that iron oxyborate exhibits charge order of the Fe ions
                      with integer 2+/3+ valence states. Meanwhile transition
                      metal oxides typically show much smaller, fractional charge
                      disproportionations. Using resonant x-ray diffraction at the
                      iron K edge, we find resonant features which are much larger
                      than those ordinarily observed in charge ordered oxides.
                      Simulations were subsequently performed using a
                      cluster-based, monoelectronic code. The nanoscale domain
                      structure prevents precise fitting; nevertheless the
                      simulations confirm the diagonal charge order symmetry, as
                      well as the unusually large charge disproportionation. We
                      have demonstrated the conversion of linearly to nonlinearly
                      polarized light and vice versa through full polarization
                      analysis. Simulations show that this effect principally
                      results from interference between the isotropic and
                      anisotropic scattering terms. This mechanism is likely to
                      account for similar observations in alternative systems.},
      keywords     = {J (WoSType)},
      cin          = {IFF-4 / IFF-5 / JARA-FIT / Jülich Centre for Neutron
                      Science JCNS (JCNS) ; JCNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB784 / I:(DE-Juel1)VDB785 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-20121112},
      pnm          = {Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI) / BioSoft: Makromolekulare Systeme und
                      biologische Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK415 / G:(DE-Juel1)FUEK505},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000281723100002},
      doi          = {10.1103/PhysRevB.82.115110},
      url          = {https://juser.fz-juelich.de/record/11617},
}