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@ARTICLE{Niermann:22298,
      author       = {Niermann, D. and Waschkowski, F. and de Groot, J. and
                      Angst, M. and Hemberger, J.},
      title        = {{D}ielectric {P}roperties of {C}harge-{O}rdered
                      {L}u{F}e2{O}4 {R}evisited: {T}he {A}pparent {I}nfluence of
                      {C}ontacts},
      journal      = {Physical review letters},
      volume       = {109},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-22298},
      pages        = {016405},
      year         = {2012},
      note         = {This work has been funded by the DFG through SFB608
                      (Cologne). Support from the initiative and networking fund
                      of Helmholtz Association by funding the Helmholtz University
                      Young Investigator Group "Complex Ordering Phenomena in
                      Multifunctional Oxides" is gratefully acknowledged. M. A.
                      thanks D. Mandrus, B. C. Sales, W. Tian and R. Jin for their
                      assistance during sample synthesis, supported by US DOE.},
      abstract     = {We show results of broadband dielectric measurements on the
                      charge ordered, proposed to be multiferroic material
                      LuFe2O4. The temperature and frequency dependence of the
                      complex permittivity as investigated for temperatures above
                      and below the charge-order transition near T-CO approximate
                      to 320 K and for frequencies up to 1 GHz can be well
                      described by a standard equivalent-circuit model considering
                      Maxwell-Wagner-type contacts and hopping induced ac
                      conductivity. No pronounced contribution of intrinsic
                      dipolar polarization could be found, and thus the
                      ferroelectric character of the charge order in LuFe2O4 has
                      to be questioned.},
      keywords     = {J (WoSType)},
      cin          = {JARA-FIT / JCNS-2 / PGI-4},
      ddc          = {550},
      cid          = {$I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)PGI-4-20110106},
      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:000306323900011},
      doi          = {10.1103/PhysRevLett.109.016405},
      url          = {https://juser.fz-juelich.de/record/22298},
}