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@ARTICLE{Sazonov:824327,
      author       = {Sazonov, Andrew and Hutanu, Vladimir and Meven, Martin and
                      Roth, Georg and Kézsmárki, István and Murakawa, Hiroshi
                      and Tokura, Yoshinori and Náfrádi, Bálint},
      title        = {{T}he low-temperature crystal structure of the multiferroic
                      melilite {C}a$_{2}$ {C}o{S}i$_{2}$ {O}$_{7}$},
      journal      = {Acta crystallographica / B},
      volume       = {72},
      number       = {1},
      issn         = {2052-5206},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2016-06936},
      pages        = {126 - 132},
      year         = {2016},
      abstract     = {In the antiferromagnetic ground state, below TN ≃ 5.7 K,
                      Ca2CoSi2O7 exhibits strong magnetoelectric coupling. For a
                      symmetry-consistent theoretical description of this
                      multiferroic phase, precise knowledge of its crystal
                      structure is a prerequisite. Here we report the results of
                      single-crystal neutron diffraction on Ca2CoSi2O7 at
                      temperatures between 10 and 250 K. The low-temperature
                      structure at 10 K was refined assuming twinning in the
                      orthorhombic space group P2(1)2(1)2 with a 3 × 3 × 1
                      supercell [a = 23.52 (1), b = 23.52 (1), c = 5.030 (3) Å]
                      compared with the high-temperature normal state [tetragonal
                      space group P42(1)m, a = b ≃ 7.86, c ≃ 5.03 Å]. The
                      precise structural parameters of Ca2CoSi2O7 at 10 K are
                      presented and compared with the literature X-ray diffraction
                      results at 130 and 170 K (low-temperature commensurate
                      phase), as well as at ∼ 500 K (high-temperature normal
                      phase).},
      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          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15) / 6212 - Quantum Condensed
                      Matter: Magnetism, Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000369393100014},
      pubmed       = {pmid:26830804},
      doi          = {10.1107/S2052520615023057},
      url          = {https://juser.fz-juelich.de/record/824327},
}