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@ARTICLE{Sazonov:824430,
      author       = {Sazonov, Andrew and Meven, Martin and Roth, Georg and
                      Georgii, Robert and Kézsmárki, István and Kocsis, Vilmos
                      and Tokunaga, Yusuke and Taguchi, Yasujiro and Tokura,
                      Yoshinori and Hutanu, Vladimir},
      title        = {{O}rigin of forbidden reflections in multiferroic
                      {B}a$_{2}${C}o{G}e$_{2}${O}$_{7}$ by neutron diffraction:
                      symmetry lowering or {R}enninger effect?},
      journal      = {Journal of applied crystallography},
      volume       = {49},
      number       = {2},
      issn         = {1600-5767},
      address      = {Copenhagen},
      publisher    = {Munksgaard},
      reportid     = {FZJ-2016-07019},
      pages        = {556 - 560},
      year         = {2016},
      abstract     = {For a symmetry-consistent theoretical description of the
                      multiferroic phase of Ba2CoGe2O7 a precise knowledge of its
                      crystal structure is a prerequisite. In a previous
                      synchrotron X-ray diffraction experiment on multiferroic
                      Ba2CoGe2O7 at room temperature, forbidden reflections were
                      found that favour the tetragonal-to-orthorhombic symmetry
                      lowering of the compound [Hutanu, Sazonov, Murakawa, Tokura,
                      Náfrádi $\&$ Chernyshov (2011), Phys. Rev. B, 84, 212101].
                      Here, the results are reported of room-temperature
                      single-crystal diffraction studies with both hot and cold
                      neutrons to differentiate between genuine symmetry lowering
                      and multiple diffraction (the Renninger effect). A
                      comparison of the experimental multiple diffraction patterns
                      with simulated ones rules out symmetry lowering. Thus, the
                      structural model based on the tetragonal space group
                      $P\overline{4}2_{1}m$ was selected to describe the
                      Ba2CoGe2O7 symmetry at room temperature. The precise
                      structural parameters from neutron diffraction at 300 K are
                      presented and compared with the previous X-ray diffraction
                      results.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15) / 6212 - Quantum Condensed
                      Matter: Magnetism, Superconductivity (POF3-621) / 524 -
                      Controlling Collective States (POF3-524)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-524},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 / EXP:(DE-MLZ)MIRA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000373702000025},
      doi          = {10.1107/S1600576716002405},
      url          = {https://juser.fz-juelich.de/record/824430},
}