Interface dipole between two metallic oxides caused by localized oxygen vacancies

  • Borisevich A
  • Lupini A
  • He J
 et al. 
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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.

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  • Albina Y. Borisevich

  • Andrew R. Lupini

  • Jun He

  • Eugene A. Eliseev

  • Anna N. Morozovska

  • George S. Svechnikov

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