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    Polar Order and Frustrated Antiferromagnetism in Perovskite Pb<sub>2</sub>MnWO<sub>6</sub> Single Crystals

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    Single crystals of the multiferroic double-perovskite Pb<sub>2</sub>MnWO<sub>6</sub> 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.) <i>Fm</i>3̅<i>m</i> to an orthorhombic structure in s.g. <i>Pn</i>2<sub>1</sub><i>a</i> 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. <i>Pnma</i> 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 Pb<sub>2</sub>MnWO<sub>6</sub> and compare these observations to reported results on related Pb<sub>2</sub>BWO<sub>6</sub> perovskites with different B cations
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