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Structural “δ doping” to control local magnetization in isovalent oxide heterostructures

Moon, E. J., He, Qian, Ghosh, S., Kirby, B. J., Pantelides, S. T., Borisevich, A. Y. and May, S. J. 2017. Structural “δ doping” to control local magnetization in isovalent oxide heterostructures. Physical Review Letters 119 (19) , 197204. 10.1103/PhysRevLett.119.197204

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Modulation and δ -doping strategies, in which atomically thin layers of charged dopants are precisely deposited within a heterostructure, have played enabling roles in the discovery of new physical behavior in electronic materials. Here, we demonstrate a purely structural “ δ -doping” strategy in complex oxide heterostructures, in which atomically thin manganite layers are inserted into an isovalent manganite host, thereby modifying the local rotations of corner-connected MnO 6 octahedra. Combining scanning transmission electron microscopy, polarized neutron reflectometry, and density functional theory, we reveal how local magnetic exchange interactions are enhanced within the spatially confined regions of suppressed octahedral rotations. The combined experimental and theoretical results illustrate the potential to utilize noncharge-based approaches to “doping” in order to enhance or suppress functional properties within spatially confined regions of oxide heterostructures.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Publisher: American Physical Society
ISSN: 0031-9007
Date of First Compliant Deposit: 9 November 2017
Date of Acceptance: 8 November 2017
Last Modified: 13 Mar 2020 06:02

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