• Shvartsman, Vladimir V.
• Yamaura, Kazunari
• Khalyavin, Dmitry D.
• Liu, Ran
• Johnson, Roger D.
• Scatena, Rebecca

Abstract

<jats:title>Abstract</jats:title><jats:p>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<jats:sub>4</jats:sub>O<jats:sub>12</jats:sub>. 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<jats:sup>2+</jats:sup> ions to establish an additional ferroelectric order out of an otherwise disordered dipolar glass. Below T<jats:sub>N</jats:sub>≈12 K, Mn<jats:sup>2+</jats:sup> spins order, making the columnar perovskites rare systems in which ordered electric and magnetic dipoles may reside on the same transition metal sublattice.</jats:p>

Topics

• perovskite
• impedance spectroscopy
• phase
• glass
• glass
• layered
• annealing