Title: Interface dipole between two metallic oxides caused by localized oxygen vacancies
Authors: Borisevich, Albina Y.
Lupini, Andrew R.
He, Jun
Eliseev, Eugene A.
Morozovska, Anna N.
Svechnikov, George S.
Yu, Pu
Chu, Ying-Hao
Ramesh, Ramamoorthy
Pantelides, Sokrates T.
Kalinin, Sergei V.
Pennycook, Stephen J.
Department of Materials Science and Engineering
Issue Date: 11-Oct-2012
Abstract: Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here, we report a study of SrRuO3 and La0.7Sr0.3MnO3 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 La0.7Sr0.3MnO3 layers. The results suggest that atomic-scale structural mapping can serve as a quantitative indicator of the presence of O vacancies at interfaces.
URI: http://dx.doi.org/10.1103/PhysRevB.86.140102
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.86.140102
Volume: 86
Issue: 14
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