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@ARTICLE{Hutanu:186431,
      author       = {Hutanu, V. and Sazonov, A. P. and Meven, M. and Roth, G.
                      and Gukasov, A. and Murakawa, H. and Tokura, Y. and Szaller,
                      D. and Bordács, S. and Kézsmárki, I. and Guduru, V. K.
                      and Peters, L. C. J. M. and Zeitler, U. and Romhányi, J.
                      and Náfrádi, B.},
      title        = {{E}volution of two-dimensional antiferromagnetism with
                      temperature and magnetic field in multiferroic
                      ${\text{{B}a}}_{2}{\text{{C}o{G}e}}_{2}{\text{{O}}}_{7}$},
      journal      = {Physical review / B},
      volume       = {89},
      number       = {6},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-00507},
      pages        = {064403},
      year         = {2014},
      abstract     = {We report on spherical neutron polarimetry and unpolarized
                      neutron diffraction in zero magnetic field as well as
                      flipping ratio and static magnetization measurements in high
                      magnetic fields on the multiferroic square lattice
                      antiferromagnet Ba2CoGe2O7. We found that in zero magnetic
                      field the magnetic space group is Cm′m2′ with sublattice
                      magnetization parallel to the [100] axis of this
                      orthorhombic setting. The spin canting has been found to be
                      smaller than 0.2∘ in the ground state. This assignment is
                      in agreement with the field-induced changes of the magnetic
                      domain structure below 40 mT as resolved by spherical
                      neutron polarimetry. The magnitude of the ordered moment has
                      been precisely determined. Above the magnetic ordering
                      temperature short-range magnetic fluctuations are observed.
                      Based on the high-field magnetization data, we refined the
                      parameters of the recently proposed microscopic spin model
                      describing the multiferroic phase of Ba2CoGe2O7.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / PGI-4 / JCNS-2 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101 /
                      EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000332372000002},
      doi          = {10.1103/PhysRevB.89.064403},
      url          = {https://juser.fz-juelich.de/record/186431},
}