Direct Observation of an Interface Dipole between Two Metallic Oxides   Caused by Localized Oxygen Vacancies
  Oxygen vacancies are increasingly recognized to play a role in phenomena observed at transition-metal oxide interfaces. Here we report a study of SrRuO3/La0.7Sr0.3MnO3 (SRO/LSMO) 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 dipole-like 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 LSMO layers. The results suggest that atomic-scale structural mapping can serve as a quantitative indicator of the presence of O vacancies at interfaces. 
A. Y. Borisevich, A. R. Lupini, J. He, E. A. Eliseev, A. N.   Morozovska, G. S. Svechnikov, P. Yu, Y. H. Chu, R. Ramesh, S. ...
cond-mat.mtrl-sci