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Meddar, L., Josse, M., Deniard, P., La, C., Andre, G., Damay, F., Petricek, V., Jobic, S., Whangbo, M.-H., Maglione, M. & Payen, C. (2009) Effect of Nonmagnetic Substituents Mg and Zn on the Phase Competition in the Multiferroic Antiferromagnet MnWO4. Chem. Mat. 21 5203–5214.
Added by: Laurent Cournède (2016-03-10 21:41:23) |
| Type de référence: Article DOI: 10.1021/cm9021358 Numéro d'identification (ISBN etc.): 0897-4756 Clé BibTeX: Meddar2009 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: crystal-structure, diffraction, magnetic-structure Créateurs: Andre, Damay, Deniard, Jobic, Josse, La, Maglione, Meddar, Payen, Petricek, Whangbo Collection: Chem. Mat. |
Consultations : 1/564
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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The effects of substituting nonmagnetic Ma(2+) and Zn2+ ions for the Mn2+ (S = 5/2) ions oil the structural, magnetic, and dielectric properties of the multiferroic frustrated antiferromagnet MnWO4 were investigated Polycrystalline samples of Mn1-xMgxWO4 and Mn1-xZnxWO4 (0 {<}= x {<}= 0.3) solid Solutions were prepared via a solid-state route and characterized via X-ray and neutron diffraction, magnetization, and dielectric permittivity measurements. Mg and Zn substitutions result in very similar effects The Neel temperature (T-N), the AF3-to-AF2 magnetic phase-transition temperature (T-2), and the critical ferroelectric temperature (T-c = T-2) of MnWO4 are reduced upon nonmagnetic doping. At the lowest temperature (T = 1.5 K), the incommensurate magnetic Structure for x(Mg) = 0 15 and v(Zn) = 0.15 corresponds to either a sinusoidal spin arrangement or an elliptical spin-spiral phase similar to the polar AF2 structure observed in MnWO4 These findings were discussed by considering the effects of the Mg and Zn Substitutions oil the crystal lattice and on the spin exchange network of MnWO4.
Added by: Laurent Cournède |