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@ARTICLE{Hutanu:190052,
      author       = {Hutanu, V. and Sazonov, A. and Meven, M. and Murakawa, H.
                      and Tokura, Y. and Bordács, S. and Kézsmárki, I. and
                      Náfrádi, B.},
      title        = {{D}etermination of the magnetic order and the crystal
                      symmetry in the multiferroic ground state of
                      {B}a$_{2}${C}o{G}e$_{2}${O}$_{7}$},
      journal      = {Physical review / B},
      volume       = {86},
      number       = {10},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-03011},
      pages        = {104401},
      year         = {2012},
      abstract     = {Detailed structural investigation of Ba2CoGe2O7 was
                      performed in its low-temperature multiferroic state
                      combining neutron diffraction with magnetization
                      measurements and the optical study of lattice vibrations on
                      single crystals. The crystal structure above (10.4 K) and
                      the crystal and magnetic structures below (2.2 K) the
                      antiferromagnetic transition temperature of TN = 6.7 K were
                      determined using neutron diffraction. The tetragonal space
                      group (SG) P-421m, corresponding to the average structure at
                      room temperature, was found to also describe the structure
                      at low temperatures well. Neutron diffraction data and
                      infrared phonon mode analysis imply no structural phase
                      transition down to 2.2 K. Orthorhombic polar SG Cmm2 is
                      proposed as a true crystal structure. Below TN, the spins of
                      the Co2+ ions form a square-lattice Néel order within the
                      (a,b) plane, while their alignment is ferromagnetic along
                      the c axis. The magnitude of the ordered moment, fully lying
                      within the (a,b) plane, is found to be 2.9(1) μB/Co2+ and
                      the easy axis of the sublattice magnetizations corresponds
                      to the [110] direction. A noncollinear spin structure due to
                      small canting is allowed.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      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)HEIDI-20140101 /
                      EXP:(DE-MLZ)POLI-HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000308287800005},
      doi          = {10.1103/PhysRevB.86.104401},
      url          = {https://juser.fz-juelich.de/record/190052},
}