Suppression of octahedral tilts and associated changes in electronic properties at epitaxial oxide heterostructure interfaces

Epitaxial oxide interfaces with broken translational symmetry have emerged as a central paradigm behind the novel behaviors of oxide superlattices. Here, we use scanning transmission electron microscopy to demonstrate a direct, quantitative unit-cell-by-unit-cell mapping of lattice parameters and ox...

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Bibliographic Details
Published in:Physical review letters 2010-08, Vol.105 (8), p.087204-087204, Article 087204
Main Authors: Borisevich, A Y, Chang, H J, Huijben, M, Oxley, M P, Okamoto, S, Niranjan, M K, Burton, J D, Tsymbal, E Y, Chu, Y H, Yu, P, Ramesh, R, Kalinin, S V, Pennycook, S J
Format: Article
Language:English
Subjects:
BISMUTH OXIDES
ELECTRICAL PROPERTIES
INTERFACES
IRON OXIDES
LANTHANUM OXIDES
LATTICE PARAMETERS
MANGANESE OXIDES
MATERIALS SCIENCE
PHASE TRANSFORMATIONS
STRONTIUM OXIDES
SUPERLATTICES
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Summary:Epitaxial oxide interfaces with broken translational symmetry have emerged as a central paradigm behind the novel behaviors of oxide superlattices. Here, we use scanning transmission electron microscopy to demonstrate a direct, quantitative unit-cell-by-unit-cell mapping of lattice parameters and oxygen octahedral rotations across the BiFeO3-La0.7 Sr0.3 MnO3 interface to elucidate how the change of crystal symmetry is accommodated. Combined with low-loss electron energy loss spectroscopy imaging, we demonstrate a mesoscopic antiferrodistortive phase transition near the interface in BiFeO3 and elucidate associated changes in electronic properties in a thin layer directly adjacent to the interface.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.087204