TY - JOUR
T1 - Interface dipole between two metallic oxides caused by localized oxygen vacancies
AU - Borisevich, Albina Y.
AU - Lupini, Andrew R.
AU - He, Jun
AU - Eliseev, Eugene A.
AU - Morozovska, Anna N.
AU - Svechnikov, George S.
AU - Yu, Pu
AU - Chu, Ying Hao
AU - Ramesh, Ramamoorthy
AU - Pantelides, Sokrates T.
AU - Kalinin, Sergei V.
AU - Pennycook, Stephen J.
PY - 2012/10/11
Y1 - 2012/10/11
N2 - Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here, we report a study of SrRuO 3 and La 0.7Sr 0.3MnO 3 interfaces using a combination of quantitative aberration-corrected scanning transmission electron microscopy, electron energy-loss spectroscopy, and density functional calculations. Cation displacements are observed at the interface, indicative of a dipolelike electric field even though both materials are nominally metallic. The observed displacements are reproduced by theory if O vacancies are present in the near-interface La 0.7Sr 0.3MnO 3 layers. The results suggest that atomic-scale structural mapping can serve as a quantitative indicator of the presence of O vacancies at interfaces.
AB - Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here, we report a study of SrRuO 3 and La 0.7Sr 0.3MnO 3 interfaces using a combination of quantitative aberration-corrected scanning transmission electron microscopy, electron energy-loss spectroscopy, and density functional calculations. Cation displacements are observed at the interface, indicative of a dipolelike electric field even though both materials are nominally metallic. The observed displacements are reproduced by theory if O vacancies are present in the near-interface La 0.7Sr 0.3MnO 3 layers. The results suggest that atomic-scale structural mapping can serve as a quantitative indicator of the presence of O vacancies at interfaces.
UR - http://www.scopus.com/inward/record.url?scp=84867378375&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.86.140102
DO - 10.1103/PhysRevB.86.140102
M3 - Article
AN - SCOPUS:84867378375
SN - 1098-0121
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
M1 - 140102
ER -