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@ARTICLE{Hutanu:188376,
      author       = {Hutanu, V. and Sazonov, Andrew 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 Peters, V. K.
                      Guduru L. C. J. M. and Zeitler, U. and Romhanyi, J. and
                      Náfrádi, B.},
      title        = {{E}volution of the 2{D} antiferromagnetism with temperature
                      and magnetic field in multiferroic
                      {B}a$_2${C}o{G}e$_2${O}$_7$di},
      reportid     = {FZJ-2015-01774},
      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 Ba$_2$CoGe$_2$O$_7$. We found that in zero
                      magnetic field the magnetic space group is $Cmm2$ with
                      sublattice magnetization parallel to the [100] axis of this
                      orthorhombic setting. The spin canting has been found to be
                      smaller than $0.2^\circ$ 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
                      Ba$_2$CoGe$_2$O$_7$.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {54G - JCNS (POF2-54G24) / 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)},
      pid          = {G:(DE-HGF)POF2-54G24 / G:(DE-HGF)POF2-422 /
                      G:(DE-HGF)POF2-424 / G:(DE-HGF)POF2-542 /
                      G:(DE-HGF)POF2-544},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 /
                      EXP:(DE-MLZ)POLI-HEIDI-20140101 /
                      EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {1401.4517},
      howpublished = {arXiv:1401.4517},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1401.4517;\%\%$},
      url          = {https://juser.fz-juelich.de/record/188376},
}