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Polar Order and Frustrated Antiferromagnetism in Perovskite Pb2MnWO6 Single Crystals.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Karpov Inst Phys Chem, Ctr Mat Sci, Vorontsovo Pole 10,K-64, Moscow 105064, Russia.
Moscow State Inst Radio Engn Elect & Automat, RU-119434 Moscow, Russia.
Karpov Inst Phys Chem, Ctr Mat Sci, Vorontsovo Pole 10,K-64, Moscow 105064, Russia.
Moscow State Inst Radio Engn Elect & Automat, RU-119434 Moscow, Russia.
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2016 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 55, no 6, 2791-2805 p.Article in journal (Refereed) Published
Abstract [en]

Single crystals of the multiferroic double-perovskite Pb2MnWO6 have been synthesized and their structural, thermal, magnetic and dielectric properties studied in detail. Pure perovskite-phase formation and stoichiometric chemical composition of the as-grown crystals are confirmed by X-ray single-crystal and powder diffraction techniques as well as energy-dispersive X-ray and inductively coupled plasma mass spectrometry. Detailed structural analyses reveal that the crystals experience a structural phase transition from the cubic space group (s.g.) Fm3╠ům to an orthorhombic structure in s.g. Pn21a at about 460 K. Dielectric data suggest that a ferrielectric phase transition takes place at that same temperature, in contrast to earlier results on polycrystalline samples, which reported a transition to s.g. Pnma and an antiferroelectric low-temperature phase. Magnetic susceptibility measurements indicate that a frustrated antiferromagnetic phase emerges below 8 K. Density functional theory based calculations confirm that the cationic order between Mn and W is favorable. The lowest total energy was found for an antiferromagnetically ordered state. However, analyses of the calculated exchange parameters revealed strongly competing antiferromagnetic interactions. The large distance between the magnetic atoms, together with magnetic frustration, is shown to be the main reason for the low value of the ordering temperature observed experimentally. We discuss the structure-property relationships in Pb2MnWO6 and compare these observations to reported results on related Pb2BWO6 perovskites with different B cations.

Place, publisher, year, edition, pages
2016. Vol. 55, no 6, 2791-2805 p.
National Category
Condensed Matter Physics Materials Chemistry Engineering and Technology
URN: urn:nbn:se:uu:diva-283303DOI: 10.1021/acs.inorgchem.5b02577ISI: 000372677800017PubMedID: 26954581OAI: oai:DiVA.org:uu-283303DiVA: diva2:918924
Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Carl Tryggers foundation , 12:419; 13:413
Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2016-05-31Bibliographically approved

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Ivanov, Sergey AKvashnin, Yaroslav OAutieri, CarmineDi Marco, IgorSanyal, BiplabEriksson, OlleNordblad, PerMathieu, Roland
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