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. 2023 Jul 17;62(29):e202305994.
doi: 10.1002/anie.202305994. Epub 2023 Jun 13.

Hybrid Improper Ferroelectricity in Columnar (NaY)MnMnTi4 O12

Rebecca Scatena  1   2 , Ran Liu  3   4 , Vladimir V Shvartsman  5 , Dmitry D Khalyavin  6 , Yoshiyuki Inaguma  7 , Kazunari Yamaura  3   4 , Alexei A Belik  3 , Roger D Johnson  2
Affiliations

Hybrid Improper Ferroelectricity in Columnar (NaY)MnMnTi4 O12

Rebecca Scatena et al. Angew Chem Int Ed Engl. .

Abstract

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)MnMnTi4 O12 . 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 Mn2+ ions to establish an additional ferroelectric order out of an otherwise disordered dipolar glass. Below TN ≈12 K, Mn2+ spins order, making the columnar perovskites rare systems in which ordered electric and magnetic dipoles may reside on the same transition metal sublattice.

Keywords: Columnar Perovskites; Ferroelectrics; Hybrid Improper Ferroelectricity; Multiferroics; Perovskite.

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