Thermodynamic properties of the new multiferroic material (NH$_4$)$_2$[FeCl$_5$(H$_2$O)]
M. Ackermann,
D. Brüning,
T. Lorenz
et al.
Abstract:NH 4 ) 2 [FeCl 5 (H 2 O)], a member of the family of antiferromagnetic A 2 [FeX 5 (H 2 O)] compounds (X = halide ion, A = alkali metal or ammonium ion) is classified as a new multiferroic material. We report the onset of ferroelectricity below 6.9 K within an antiferromagnetically ordered state (T N 7.25 K). The corresponding electric polarization can drastically be influenced by applying magnetic fields. Based on measurements of pyroelectric currents, dielectric constants and magnetization we characterize the… Show more
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