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@ARTICLE{Reim:845494,
      author       = {Reim, Johannes and Rosén, E. and Zaharko, O. and Mostovoy,
                      M. and Robert, J. and Valldor, M. and Schweika, W.},
      title        = {{N}eutron diffraction study and theoretical analysis of the
                      antiferromagnetic order and the diffuse scattering in the
                      layered kagome system {C}a{B}a{C}o$_2${F}e$_2${O}$_7$},
      journal      = {Physical review / B},
      volume       = {97},
      number       = {14},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-02728},
      pages        = {144402},
      year         = {2018},
      abstract     = {The hexagonal swedenborgite, CaBaCo2Fe2O7, is a chiral
                      frustrated antiferromagnet, in which magnetic ions form
                      alternating kagome and triangular layers. We observe a
                      long-range √3×√3 antiferromagnetic order setting in
                      below TN=160 K by neutron diffraction on single crystals of
                      CaBaCo2Fe2O7. Both magnetization and polarized neutron
                      single crystal diffraction measurements show that close to
                      TN spins lie predominantly in the ab plane, while upon
                      cooling the spin structure becomes increasingly canted due
                      to Dzyaloshinskii-Moriya interactions. The ordered structure
                      can be described and refined within the magnetic space group
                      P31m′. Diffuse scattering between the magnetic peaks
                      reveals that the spin order is partial. Monte Carlo
                      simulations based on a Heisenberg model with two
                      nearest-neighbor exchange interactions show a similar
                      diffuse scattering and coexistence of the √3×√3 order
                      with disorder. The coexistence can be explained by the
                      freedom to vary spins without affecting the long-range
                      order, which gives rise to ground-state degeneracy.
                      Polarization analysis of the magnetic peaks indicates the
                      presence of long-period cycloidal spin correlations
                      resulting from the broken inversion symmetry of the lattice,
                      in agreement with our symmetry analysis.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000429208800006},
      doi          = {10.1103/PhysRevB.97.144402},
      url          = {https://juser.fz-juelich.de/record/845494},
}