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@ARTICLE{Valldor:20465,
      author       = {Valldor, M. and Hermann, R. and Wuttke, J. and Zamponi, M.
                      and Schweika, W.},
      title        = {{S}pin correlation in the extended kagome system
                      {Y}ba{C}o3{F}e{O}7},
      journal      = {Physical review / B},
      volume       = {84},
      number       = {22},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-20465},
      pages        = {224426},
      year         = {2011},
      note         = {We are grateful for comments from Daniel Khomskii and Gary
                      J. Long. Moulay Sougrati is acknowledged for assisting in
                      the collection of the Mossbauer spectral data. We would like
                      to thank Anne Mochel for help in measuring magnetic
                      susceptibility of the isotope-enriched sample. This work was
                      supported by DFG through the project SFB 608, by the FNRS
                      through Grants No. 9.456595 and 1.5.064.5, and by the
                      Helmholtz Association of German Research Centers through
                      Grant No. NG-407. Part of this research at the instrument
                      BASIS Oak Ridge National Laboratories Spallation Neutron
                      Source was sponsored by the Scientific User Facilities
                      Division, Office of Basic Energy Sciences, US Department of
                      Energy.},
      abstract     = {The transition metal-based oxide YBaCo3FeO7 is structurally
                      related to the mineral Swedenborgite SbNaBe4O7, a polar
                      noncentrosymmetric crystal system. The magnetic Co3Fe
                      sublattice consists of a tetrahedral network containing
                      kagome-like layers with trigonal interlayer sites. This
                      geometry causes frustration effects for magnetic ordering,
                      which were investigated by magnetization measurements,
                      Mossbauer spectroscopy, polarized neutron diffraction, and
                      neutron spectroscopy. Magnetization measurement and neutron
                      diffraction do not show long range ordering even at low
                      temperature (1 K), although a strong antiferromagnetic
                      coupling (similar to 2000 K) is deduced from the magnetic
                      susceptibility. Below 590 K we observe two features, a
                      spontaneous weak anisotropic magnetization hysteresis along
                      the polar crystallographic axis and a hyperfine field on the
                      Fe kagome sites, whereas the Fe spins on the interlayer
                      sites remain idle. Below similar to 50 K the onset of a
                      hyperfine field shows the development of moments static on
                      the Mossbauer time scale also for the Fe interlayer sites.
                      Simultaneously, an increase of spin correlations is found by
                      polarized neutron diffraction. The relaxation part of the
                      dynamic response has been further investigated by
                      high-resolution neutron spectroscopy, which reveals that the
                      spin correlations start to freeze below similar to 50 K.
                      Monte Carlo simulations show that the neutron scattering
                      results at lower temperatures are compatible with a recent
                      proposal that the particular geometric frustration in the
                      Swedenborgite structure promotes quasi-one-dimensional
                      partial order.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS-2 / JARA-FIT / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      experiment   = {EXP:(DE-MLZ)DNS-20140101 / EXP:(DE-MLZ)SPHERES-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298556000008},
      doi          = {10.1103/PhysRevB.84.224426},
      url          = {https://juser.fz-juelich.de/record/20465},
}