Quintuple perovskites Ln<inf>2</inf>Ba<inf>3</inf>Fe<inf>5-x</inf>Co<inf>x</inf>O<inf>15-δ</inf> (Ln = Sm, Eu) Nanoscale ordering and unconventional magnetism - Archive ouverte HAL Access content directly
Journal Articles Journal of Materials Chemistry C Year : 2015

Quintuple perovskites Ln2Ba3Fe5-xCoxO15-δ (Ln = Sm, Eu) Nanoscale ordering and unconventional magnetism

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Abstract

Quintuple perovskites Ln2Ba3Fe5-xCoxO15-δ, with Ln = Sm, Eu have been synthesized for x values varying from 0 to 2. The HRTEM and HAADF investigations show that these oxides are ordered at the nanoscale with a tetragonal "ap × ap × 5ap" lattice, corresponding to an ordered fivefold stacking of the Ba and Ln layers. These structures are in fact chemically twinned, so that only cubic or pseudo-cubic symmetry is detected by XRD investigation. The detailed magnetic study shows the existence of short range antiferromagnetic ordering, canted in nature in the temperature range from 5 to 330 K. This particular behavior is interpreted on the basis of local antiferromagnetic M-O-M (M = Fe/Co) interactions within the nanodomains that are limited by pinning of the Co/Fe spins at the boundaries. © The Royal Society of Chemistry.
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hal-02184155 , version 1 (15-07-2019)

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A.K. Kundu, O.I. Lebedev, N.E. Volkova, M.M. Seikh, V. Caignaert, et al.. Quintuple perovskites Ln2Ba3Fe5-xCoxO15-δ (Ln = Sm, Eu) Nanoscale ordering and unconventional magnetism. Journal of Materials Chemistry C, 2015, 3 (21), pp.5398-5405. ⟨10.1039/c5tc00494b⟩. ⟨hal-02184155⟩
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