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@ARTICLE{Brning:888331,
      author       = {Brüning, Daniel and Fröhlich, Tobias and Langenbach,
                      Malte and Leich, Thomas and Meven, Martin and Becker, Petra
                      and Bohatý, Ladislav and Grüninger, Markus and Braden,
                      Markus and Lorenz, Thomas},
      title        = {{M}agnetoelectric coupling in the mixed erythrosiderite
                      [({NH}$_4$)$_{1−x}${K}$_x$]$_2$[{F}e{C}l$_5$({H}$_2${O})]},
      journal      = {Physical review / B},
      volume       = {102},
      number       = {5},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2020-04850},
      pages        = {054413},
      year         = {2020},
      abstract     = {We present a study of the dielectric, structural and
                      magnetic properties of the multiferroic orlinear
                      magnetoelectric substitution series
                      [(NH4)1􀀀xKx]2[FeCl5(H2O)]. Pyroelectric currents,
                      magneticsusceptibilities, and thermodynamic properties were
                      examined on large single crystals of theerythrosiderite
                      compounds and detailed magnetic-eld versus temperature phase
                      diagrams are derivedfor three dierent substitution levels.
                      With increasing potassium concentration the material istuned
                      from a multiferroic (x 0:06) to a linear magnetoelectric (x
                      0:15) ground state. In contrastto the respective pure parent
                      compounds with x = 0 or 1, however, the ferroelectric or
                      linear magnetoelectricpolarization in none of the
                      substituted samples is switchable by external electric
                      elds,because these samples exhibit a signicant electric
                      polarization already above the magnetic orderingtransition.
                      The polarization arises at a higher-lying structural phase
                      transition that is examined byTHz spectroscopy and by
                      comprehensive neutron-diraction experiments on a deuterated
                      pure singlecrystal. The structural phase transition is
                      attributed to an ordering of NH+4 tetrahedra but doesnot
                      break inversion symmetry in the pure material, while nite K
                      content causes pyroelectricity.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G15 - FRM II / MLZ
                      (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000557288200001},
      doi          = {10.1103/PhysRevB.102.054413},
      url          = {https://juser.fz-juelich.de/record/888331},
}