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Atomically engineered oxide multilayers and superlattices display uniqueproperties responsive to the electronic and atomic structures of theinterfaces. We have followed the growth of ferroelectric BaTiO3 on SrRuO3electrode with in situ atomic scale analysis of the surface structure at eachstage. An oxygen-induced surface reconstruction of SrRuO3 leads to formation ofSrO rows spaced at twice the bulk periodicity. This reconstruction modifies thestructure of the first BaTiO3 layers grown subsequently, including intermixingobserved with cross-section spectroscopy. These observations reveal that thiscommon oxide interface is much more interesting than previously reported, andprovide a paradigm for oxygen engineering of oxide structure at an interface.

Oxygen-Induced Surface Reconstruction of SrRuO3 and Its Effect on the BaTiO3 Interface