Interface dipole between two metallic oxides caused by localized oxygen vacancies
Publication Type
Journal Article
Authors
Borisevich, A.Y., A.R. Lupini, J. He, E.A. Eliseev, A.N. Morozovska, G.S. Svechnikov, P. Yu, Y.-H. Chu, Ramamoorthy Ramesh, S.T. Pantelides, S.V. Kalinin, S.J. Pennycook
DOI
Abstract
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. © 2012 American Physical Society.
Journal
Physical Review B - Condensed Matter and Materials Physics
Volume
86
Year of Publication
2012
ISSN
10980121
Notes
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