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@ARTICLE{Dutta:1018017,
      author       = {Dutta, Rajesh and Thoma, Henrik and Sazonov, Andrew and
                      Náfrádi, Bálint and Meven, Martin and Gukasov, Arsen and
                      Kocsis, Vilmos and Zeitler, Uli and Puri, Alessandro and
                      Tokunaga, Yusuke and Taguchi, Yasujiro and Tokura, Yoshinori
                      and Bordács, Sándor and Kézsmárki, István and Hutanu,
                      Vladimir},
      title        = {{M}agnetic structure of the two-dimensional {XY}
                      antiferromagnet {S}r$_2${C}o{S}i$_2${O}$_7$ studied using
                      single-crystal neutron diffraction},
      journal      = {Physical review / B},
      volume       = {107},
      number       = {1},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2023-04487},
      pages        = {014420},
      year         = {2023},
      abstract     = {We report a combined polarized and unpolarized neutron
                      diffraction study on a multiferroic Sr$_2$CoSi$_2$O$_7$
                      (SCSO) single crystal below and above the antiferromagnetic
                      ordering temperature $T_N$ = 6.5 K. Unpolarized neutron
                      diffraction measurements at 15 K confirm the melilite-type
                      tetragonal $P\overline{4}2_1m$ space group as the parent
                      structure of SCSO. The low temperature study at 2.3 K, in
                      contrast, reveals symmetry lowering with the orthorhombic
                      Cmm′2′ and $P2_12′_12′$ magnetic space groups being
                      equally possible. In these $Cmm′2′$ and $P2_12′_12′$
                      magnetic space groups we obtain a very similar ordered
                      magnetic moment about 2.86 and 2.94μB/Co$^{2+}$,
                      respectively, which lies in the $ab$ plane. Our spin
                      polarized flipping ratio measurements under an applied
                      magnetic field of 6 T in the paramagnetic state support the
                      results of our bulk magnetization data, indicating strong
                      easy-plane spin anisotropy, responsible for the in-plane
                      order below $T_N$.},
      cin          = {JCNS-FRM-II / JARA-FIT / JCNS-2 / MLZ / JCNS-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-588b)4597118-3 / I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000927608900003},
      doi          = {10.1103/PhysRevB.107.014420},
      url          = {https://juser.fz-juelich.de/record/1018017},
}