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@ARTICLE{Sazonov:1018016,
      author       = {Sazonov, A. and Thoma, H. and Dutta, R. and Meven, Martin
                      and Gukasov, A. and Fittipaldi, R. and Granata, V. and
                      Masuda, T. and Náfrádi, B. and Hutanu, V.},
      title        = {{M}agnetic structure of the magnetoelectric material
                      {B}a$_2${M}n{G}e$_2${O}$_7$},
      journal      = {Physical review / B},
      volume       = {108},
      number       = {9},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2023-04486},
      pages        = {094412},
      year         = {2023},
      abstract     = {Detailed investigation of Ba$_2$MnGe$_2$O$_7$ was performed
                      in its low-temperature magnetoelectric state combining
                      neutron diffraction with magnetization measurements on
                      single crystals. In the paramagnetic state at 10 K,
                      polarized neutron diffraction was applied to reveal the
                      components of the susceptibility tensor. The crystal and
                      magnetic structures below the antiferromagnetic transition
                      temperature of $T_N$ ≈ 4K were determined using
                      unpolarized neutron diffraction. This data implies no
                      structural phase transition from 10K down to 2.5K and is
                      well described within the tetragonal space group
                      $P\overline{4}2_1m$. We found that in zero magnetic field
                      the magnetic space group is either $C_cmc2_1$ or
                      $P_c2_12_12_1$ with antiferromagnetic order along the [110]
                      or [100] directions, respectively, while neighboring spins
                      along the [001] axis are ordered antiferromagnetically. A
                      non-collinear spin arrangement due to small canting within
                      the ab plane is allowed by symmetry and observed
                      experimentally. The ordered moment is found to be 3.24(3)
                      μB/Mn$^{2+}$ at 2.5K and the temperaturefield dependent
                      magnetic phase diagram is mapped out by macroscopic
                      magnetization. Distinct differences between the magnetic
                      structure of Ba$_2$MnGe$_2$O$_7$ as compared to those of
                      Ba$_2$CoGe$_2$O$_7$ and Ca$_2$CoSi$_2$O$_7$ are discussed.},
      cin          = {JCNS-FRM-II / JCNS-2 / JARA-FIT / MLZ / JCNS-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      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:001075130700003},
      doi          = {10.1103/PhysRevB.108.094412},
      url          = {https://juser.fz-juelich.de/record/1018016},
}