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Paper detail

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.

preprint2011arXivOpen access
A. Y. BorisevichA. R. LupiniJ. HeE. A. EliseevA. N. MorozovskaG. S. SvechnikovP. YuY. H. ChuR. RameshS. T. PantelidesS. V. KalininS. J. Pennycook
cond-mat.mtrl-sci
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A. Y. BorisevichA. R. LupiniJ. HeE. A. EliseevA. N. MorozovskaG. S. SvechnikovP. YuY. H. ChuR. RameshS. T. PantelidesS. V. KalininS. J. Pennycook

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