Features of the structure and dynamics of Me1−x (NH4) x SCN (Me = K, Rb) mixed crystals

Smirnov, L. S.; Natkaniec, I.; Belushkin, A. B.; Smith, David R.; Prager, M.

doi:10.1134/s1027451009060019

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Librational frequencies vary strongly for different compounds [40]. Excitation energies of, e.g., 5.9 and 4 meV were observed in neutron scattering on (NH 4 ) 2 PdCl 6 [41] and K 1−x (NH 4 ) x SCN [42], respectively, suggesting a common origin with the 5.2-meV mode in (NH 4 ) 2 [FeCl 5 (H 2 O)]. A disordered phase, in contrast, may show a much lower potential barrier between different orientations and thus a very different excitation energy.…”

Section: A Structural Phase Transitionmentioning

confidence: 99%

Domain switching and exchange bias control by electric field in the multiferroic conical magnet Mn2GeO4

2020

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We present a study of the dielectric, structural, and magnetic properties of the multiferroic or linear magnetoelectric substitution series [(NH 4) 1−x K x ] 2 [FeCl 5 (H 2 O)]. Pyroelectric currents, magnetic susceptibilities, and thermodynamic properties were examined on large single crystals of the erythrosiderite compounds and detailed magnetic-field versus temperature phase diagrams are derived for three different substitution levels. With increasing potassium concentration the material is tuned from a multiferroic (x 0.06) to a linear magnetoelectric (x 0.15) ground state. In contrast to the respective pure parent compounds with x = 0 or 1, however, the ferroelectric or linear magnetoelectric polarization in none of the substituted samples is switchable by external electric fields because these samples exhibit a significant electric polarization already above the magnetic ordering transition. The polarization arises at a higher-lying structural phase transition that is examined by THz spectroscopy, and, on a deuterated pure single crystal, by comprehensive neutron-diffraction experiments. The structural phase transition is attributed to an ordering of NH + 4 tetrahedra but does not break inversion symmetry in the pure material, while a finite K content causes pyroelectricity.

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Section: A Structural Phase Transitionmentioning

confidence: 99%

Domain switching and exchange bias control by electric field in the multiferroic conical magnet Mn2GeO4

2020

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Magnetoelectric coupling in the mixed erythrosiderite [(NH4)1−xKx]<

et al. 2020

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We present a study of the dielectric, structural, and magnetic properties of the multiferroic or linear magnetoelectric substitution series [(NH4)1−xKx]2[FeCl5(H2O)]. Pyroelectric currents, magnetic susceptibilities, and thermodynamic properties were examined on large single crystals of the erythrosiderite compounds and detailed magnetic-field versus temperature phase diagrams are derived for three different substitution levels. With increasing potassium concentration the material is tuned from a multiferroic (x ≤ 0.06) to a linear magnetoelectric (x ≥ 0.15) ground state. In contrast to the respective pure parent compounds with x = 0 or 1, however, the ferroelectric or linear magnetoelectric polarization in none of the substituted samples is switchable by external electric fields, because these samples exhibit a significant electric polarization already above the magnetic ordering transition. The polarization arises at a higher-lying structural phase transition that is examined by THz spectroscopy and, on a deuterated pure single crystal, by comprehensive neutron-diffraction experiments. The structural phase transition is attributed to an ordering of NH + 4 tetrahedra but does not break inversion symmetry in the pure material, while a finite K content causes pyroelectricity.

show abstract

Features of the structure and dynamics of Me1−x (NH4) x SCN (Me = K, Rb) mixed crystals

Cited by 2 publications

References 27 publications

Domain switching and exchange bias control by electric field in the multiferroic conical magnet Mn2GeO4

Domain switching and exchange bias control by electric field in the multiferroic conical magnet Mn2GeO4

Magnetoelectric coupling in the mixed erythrosiderite [(NH4)1−xKx]<

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