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Atomic-Scale Control of Electronic Structure and Ferromagnetic Insulating State in Perovskite Oxide Superlattices by Long-Range Tuning of BO6 Octahedra

Accepted version
Peer-reviewed

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Type

Article

Change log

Authors

Zhu, B 
Zhu, R 
Wang, Q 
Lu, P 

Abstract

jats:titleAbstract</jats:title>jats:pControl of BOjats:sub6</jats:sub> octahedral rotations at the heterointerfaces of dissimilar ABOjats:sub3</jats:sub> perovskites has emerged as a powerful route for engineering novel physical properties. However, its impact length scale is constrained at 2–6 unit cells close to the interface and the octahedral rotations relax quickly into bulk tilt angles away from interface. Here, a long‐range (up to 12 unit cells) suppression of MnOjats:sub6</jats:sub> octahedral rotations in Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> through the formation of superlattices with SrTiOjats:sub3</jats:sub> can be achieved. The suppressed MnOjats:sub6</jats:sub> octahedral rotations strongly modify the magnetic and electronic properties of Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> and hence create a new ferromagnetic insulating state with enhanced Curie temperature of 235 K. The emergent properties in Lajats:sub0.9</jats:sub>Bajats:sub0.1</jats:sub>MnOjats:sub3</jats:sub> arise from a preferential occupation of the out‐of‐plane Mn jats:italicd</jats:italic>jats:sub3</jats:sub>jats:italicjats:subz</jats:sub></jats:italic>jats:sup2</jats:sup>jats:sub−</jats:sub>jats:italicjats:subr</jats:sub></jats:italic>jats:sup2</jats:sup> orbital and a reduced Mn ejats:subg</jats:sub> bandwidth, induced by the suppressed octahedral rotations. The realization of long‐range tuning of BOjats:sub6</jats:sub> octahedra via superlattices can be applicable to other strongly correlated perovskites for exploring new emergent quantum phenomena.</jats:p>

Description

Keywords

ABO(3)perovskite oxides, BO(6)octahedra, ferromagnetic insulators, interfaces, manganite thin films

Journal Title

Advanced Functional Materials

Conference Name

Journal ISSN

1616-301X
1616-3028

Volume Title

30

Publisher

Wiley

Rights

All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/N004272/1)
Engineering and Physical Sciences Research Council (EP/L011700/1)
Isaac Newton Trust (Minute 1338(k))
Royal Academy of Engineering (RAEng) (CiET1819\24)