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@ARTICLE{Korshunov:889949,
      author       = {Korshunov, A. N. and Kurbakov, A. I. and Safiulina, I. A.
                      and Susloparova, A. E. and Pomjakushin, V. Yu. and Mueller,
                      Th.},
      title        = {{L}ong-range magnetic ordering in {L}i$_2${M}n{G}e{O}$_4$
                      and precursor short-range spin correlations},
      journal      = {Physical review / B},
      volume       = {102},
      number       = {21},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2021-00554},
      pages        = {214420},
      year         = {2020},
      abstract     = {Long-range magnetic ordering and short-range spin
                      correlations in layered noncentrosymmetric orthogermanate
                      Li2MnGeO4 were studied by means of polarized and unpolarized
                      neutron scattering. The combined Rietveld refinement of
                      synchrotron and neutron powder diffraction data at room
                      temperature within the Pmn21 space group allowed us to
                      specify the details of the crystal structure. According to
                      the additional Bragg peaks in low-temperature neutron
                      diffraction patterns a long-range antiferromagnetic ordering
                      with the propagation vector k=(1/21/21/2) has been found
                      below TN≈8K. Symmetry analysis revealed the model of the
                      ground state spin structure within the Cac (no. 9.41)
                      magnetic space group. It is represented by the noncollinear
                      ordering of manganese atoms with a refined magnetic moment
                      of 4.9μB/Mn2+ at 1.7 K, which corresponds to the saturated
                      value for the high-spin configuration S=5/2. Diffuse
                      magnetic scattering was detected on the neutron diffraction
                      patterns at temperatures just above TN. Its temperature
                      evolution was investigated in detail by polarized neutron
                      scattering with the following XYZ-polarization analysis.
                      Reverse Monte Carlo simulation of diffuse scattering data
                      showed the development of short-range ordering in Li2MnGeO4,
                      which is symmetry consistent on a small scale with the
                      long-range magnetic state below TN. The reconstructed radial
                      spin-pair correlation function S(0)S(r) displayed the
                      predominant role of antiferromagnetic correlations. It was
                      found that spin correlations are significant only for the
                      nearest magnetic neighbors and almost disappear at r≈12Å
                      at 10 K. Temperature dependence of the diffuse scattering
                      implies short-range ordering long before the magnetic phase
                      transition. Besides, the spin arrangement was found to be
                      similar in both cases above and below TN. As a result, an
                      exhaustive picture of the gradual formation of magnetic
                      ordering in Li2MnGeO4 is presented.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000599092100005},
      doi          = {10.1103/PhysRevB.102.214420},
      url          = {https://juser.fz-juelich.de/record/889949},
}