Publication Type:Journal Article
Source:Physical Review Letters, Volume 105, Number 8 (2010)
Keywords:Antiferrodistortive, crystal symmetry, Electron energy loss spectroscopy, Electronic properties, Energy dissipation, Heterojunctions, Heterostructure interfaces, Lattice parameters, Low loss, Manganese oxide, Mesoscopics, Octahedral rotations, Oxide interfaces, Oxide superlattices, oxygen, Phase interfaces, phase transitions, scanning transmission electron microscopy, Thin layers, Translational symmetry, transmission electron microscopy, Unit cells
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-La0.7Sr 0.3MnO3 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. © 2010 The American Physical Society.
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