Structural and magnetic phase transitions in Cs 2 [FeCl 5 (H 2 O)]

The compound [Formula: see text] is magnetoelectric but not multiferroic with an erythrosiderite-related structure. We present a comprehensive investigation of its structural and antiferromagnetic phase transitions by polarization microscopy, pyroelectric measurements, x-ray diffraction and neutron...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-07, Vol.30 (29), p.295403
Main Authors: Fröhlich, Tobias, Stein, Jonas, Bohatý, Ladislav, Becker, Petra, Gukasov, Arsen, Braden, Markus
Format: Article
Language:English
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Summary:The compound [Formula: see text] is magnetoelectric but not multiferroic with an erythrosiderite-related structure. We present a comprehensive investigation of its structural and antiferromagnetic phase transitions by polarization microscopy, pyroelectric measurements, x-ray diffraction and neutron diffraction. At about [Formula: see text] K, the compound changes its symmetry from Cmcm to I2/c, with a doubling of the original c-axis. This transformation is associated with rotations of the [Formula: see text] octahedra and corresponds to an ordering of the [Formula: see text] molecules and of the related [Formula: see text] bonds. A significant ferroelectric polarization can be excluded for this transition by precise pyrocurrent measurements. The antiferromagnetic phase transition occurring at [Formula: see text] results in the magnetic space group [Formula: see text], which perfectly agrees with previous measurements of the linear magnetoelectric effect and magnetization.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aaca6c