Abstract
We have obtained STM images and STS data with atomic-scale resolution for SrTiO3(100) surface annealed in UHV at 1200 °C. A√5 × √5-R26.6° surface superstructure indicating oxygen vacancy ordering has been observed. The STS data provide evidence for a localized surface state arising from oxygen vacancies at 1.35 eV below the Fermi level. STM images of the √5 × √5 structure correspond to the surface orbital of the ordered Ti-oxygen vacancy complex.
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