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 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.
Borisevich
A Y
AY
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. albinab@ornl.gov
Chang
H J
HJ
Huijben
M
M
Oxley
M P
MP
Okamoto
S
S
Niranjan
M K
MK
Burton
J D
JD
Tsymbal
E Y
EY
Chu
Y H
YH
Yu
P
P
Ramesh
R
R
Kalinin
S V
SV
Pennycook
S J
SJ