• Medientyp: E-Artikel
  • Titel: Magnetoelectric coupling in the mixed erythrosiderite [(NH$_4$)$_{1−x}$K$_x$]$_2$[FeCl$_5$(H$_2$O)]
  • Beteiligte: Brüning, Daniel [VerfasserIn]; Fröhlich, Tobias [VerfasserIn]; Langenbach, Malte [VerfasserIn]; Leich, Thomas [VerfasserIn]; Meven, Martin [VerfasserIn]; Becker, Petra [VerfasserIn]; Bohatý, Ladislav [VerfasserIn]; Grüninger, Markus [VerfasserIn]; Braden, Markus [VerfasserIn]; Lorenz, Thomas [VerfasserIn]
  • Erschienen: Inst., 2020
  • Erschienen in: Physical review / B 102(5), 054413 (2020). doi:10.1103/PhysRevB.102.054413
  • Sprache: Englisch
  • 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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  • Beschreibung: 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.
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