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@ARTICLE{Goremychkin:15731,
      author       = {Goremychkin, E.A. and Osborn, R. and Wang, C.H. and
                      Lumsden, M.D. and McGuire, M.A. and Sefat, A.S. and Sales,
                      B.C. and Mandrus, D. and Ronnow, H.M. and Su, Y. and
                      Christianson, A.D.},
      title        = {{S}patial inhomogeneity in {RF}e{A}s{O}(1-x){F}(x) ({R} =
                      {P}r, {N}d) determined from rare-earth crystal-field
                      excitations},
      journal      = {Physical review / B},
      volume       = {83},
      number       = {21},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-15731},
      pages        = {212505},
      year         = {2011},
      note         = {We acknowledge useful discussions with E. Dagotto and
                      assistance in the neutron-scattering experiments from O.
                      Garlea (ORNL), T. Guidi (ISIS), A. Orecchini (ILL), and M.
                      Koza (ILL). Research at Argonne and Oak Ridge is supported
                      by the US Department of Energy, Office of Science, Office of
                      Basic Energy Sciences, Materials Sciences and Engineering
                      Division and Scientific User Facilities Division (Argonne
                      Contract No. DE-AC02-06CH11357).},
      abstract     = {We report inelastic neutron-scattering measurements of
                      crystal-field transitions in PrFeAsO, PrFeAsO0.87F0.13, and
                      NdFeAsO0.85F0.15. Doping with fluorine produces additional
                      crystal-field excitations, providing evidence that there are
                      two distinct charge environments around the rare-earth ions,
                      with probabilities that are consistent with a random
                      distribution of dopants on the oxygen sites. The 4f
                      electrons of the Pr3+ and Nd3+ ions have nonmagnetic and
                      magnetic ground states, respectively, indicating that the
                      enhancement of T-c compared to LaFeAsO1-xFx is not due to
                      rare-earth magnetism.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000292127500001},
      doi          = {10.1103/PhysRevB.83.212505},
      url          = {https://juser.fz-juelich.de/record/15731},
}