title: Suppression of octahedral tilts and associated changes in electronic properties at epitaxial oxide heterostructure interfaces.
abstract: 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.
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. albinab@ornl.gov
authors.forename: A Y
authors.initials: AY
authors.lastname: Borisevich
authors.forename: H J
authors.initials: HJ
authors.lastname: Chang
authors.forename: M
authors.initials: M
authors.lastname: Huijben
authors.forename: M P
authors.initials: MP
authors.lastname: Oxley
authors.forename: S
authors.initials: S
authors.lastname: Okamoto
authors.forename: M K
authors.initials: MK
authors.lastname: Niranjan
authors.forename: J D
authors.initials: JD
authors.lastname: Burton
authors.forename: E Y
authors.initials: EY
authors.lastname: Tsymbal
authors.forename: Y H
authors.initials: YH
authors.lastname: Chu
authors.forename: P
authors.initials: P
authors.lastname: Yu
authors.forename: R
authors.initials: R
authors.lastname: Ramesh
authors.forename: S V
authors.initials: SV
authors.lastname: Kalinin
authors.forename: S J
authors.initials: SJ
authors.lastname: Pennycook