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@ARTICLE{Sazonov:840617,
      author       = {Sazonov, A. and Hutanu, V. and Meven, M. and Roth, G. and
                      Murakawa, H. and Tokura, Y. and Guduru, V. K. and Peters, L.
                      C. J. M. and Zeitler, U. and Kiss, L. F. and Szaller, D. and
                      Náfrádi, B. and Kézsmárki, I.},
      title        = {{M}agnetic structure of the magnetoelectric material
                      {C}a$_{2}${C}o{S}i$_{2}${O}$_{7}$},
      journal      = {Physical review / B},
      volume       = {95},
      number       = {17},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-08122},
      pages        = {174431},
      year         = {2017},
      abstract     = {Detailed investigation of Ca$_{2}$CoSi$_{2}$O$_{7}$ was
                      performed in its low-temperature magnetoelectric state
                      combining neutron diffraction with magnetization
                      measurements on single crystals. The crystal and magnetic
                      structures well below the antiferromagnetic transition
                      temperature of TN≈5.7 K were determined using neutron
                      diffraction. Neutron diffraction data imply no structural
                      phase transition from 10 K down to 2.5 K and are well
                      described within the orthorhombic space group P21212 with a
                      3×3×1 supercell compared with the high-temperature
                      unmodulated state (tetragonal space group P¯421m). We found
                      that in zero magnetic field the magnetic space group is
                      P212′12′ with antiferromagnetic order along the [100] or
                      [010] axes for two types of 90∘ twin domains, while
                      neighboring spins along the [001] axis are ordered
                      ferromagnetically. A noncollinear spin arrangement due to
                      small canting within the ab plane is allowed by symmetry and
                      leads to the existence of the tiny spontaneous magnetization
                      below TN. The ordered moment with a magnitude of about 2.8
                      μB/Co$_{2}$+ at 2.5 K lies in the ab plane. Distinct
                      differences between the magnetic structure of
                      Ca$_{2}$CoSi$_{2}$O$_{7}$ as compared to those of
                      Ba$_{2}$CoGe$_{2}$O$_{7}$ and Sr$_{2}$CoSi$_{2}$O$_{7}$ are
                      discussed.},
      cin          = {JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {144 - Controlling Collective States (POF3-144) / 6213 -
                      Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101 /
                      EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000401997600001},
      doi          = {10.1103/PhysRevB.95.174431},
      url          = {https://juser.fz-juelich.de/record/840617},
}