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Brüning, Daniel [Author]; Fröhlich, Tobias [Author]; Langenbach, Malte [Author]; Leich, Thomas [Author]; Meven, Martin [Author]; Becker, Petra [Author]; Bohatý, Ladislav [Author]; Grüninger, Markus [Author]; Braden, Markus [Author]; Lorenz, Thomas [Author]

Magnetoelectric coupling in the mixed erythrosiderite [(NH$_4$)$_{1−x}$K$_x$]$_2$[FeCl$_5$(H$_2$O)]

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  • Media type: E-Article
  • Title: Magnetoelectric coupling in the mixed erythrosiderite [(NH$_4$)$_{1−x}$K$_x$]$_2$[FeCl$_5$(H$_2$O)]
  • Contributor: Brüning, Daniel [Author]; Fröhlich, Tobias [Author]; Langenbach, Malte [Author]; Leich, Thomas [Author]; Meven, Martin [Author]; Becker, Petra [Author]; Bohatý, Ladislav [Author]; Grüninger, Markus [Author]; Braden, Markus [Author]; Lorenz, Thomas [Author]
  • imprint: Inst., 2020
  • Published in: Physical review / B 102(5), 054413 (2020). doi:10.1103/PhysRevB.102.054413
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevB.102.054413
  • ISSN: 2469-9977; 1094-1622; 0556-2805; 1550-235X; 1050-2947; 1098-0121; 0163-1829; 1538-4446; 1095-3795; 2469-9969; 1538-4489; 2469-9950
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  • Description: 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.
  • Access State: Open Access