Hybrid Improper Ferroelectricity in Columnar (NaY)MnMnTi 4 O 12

We show that cation ordering on A site columns, oppositely displaced via coupling to B site octahedral tilts, results in a polar phase of the columnar perovskite (NaY)MnMnTi O . This scheme is similar to hybrid improper ferroelectricity found in layered perovskites, and can be considered a realisati...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-07, Vol.62 (29), p.e202305994
Main Authors: Scatena, Rebecca, Liu, Ran, Shvartsman, Vladimir V, Khalyavin, Dmitry D, Inaguma, Yoshiyuki, Yamaura, Kazunari, Belik, Alexei A, Johnson, Roger D
Format: Article
Language:English
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Summary:We show that cation ordering on A site columns, oppositely displaced via coupling to B site octahedral tilts, results in a polar phase of the columnar perovskite (NaY)MnMnTi O . This scheme is similar to hybrid improper ferroelectricity found in layered perovskites, and can be considered a realisation of hybrid improper ferroelectricity in columnar perovskites. The cation ordering is controlled by annealing temperature and when present it also polarises the local dipoles associated with pseudo-Jahn-Teller active Mn ions to establish an additional ferroelectric order out of an otherwise disordered dipolar glass. Below T ≈12 K, Mn spins order, making the columnar perovskites rare systems in which ordered electric and magnetic dipoles may reside on the same transition metal sublattice.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202305994