The contribution of oxygen deficiencies to SrTiO 3(001) surface reconstructions is studied using low-energy electron diffraction and scanning tunneling microscopy. We have prepared a SrTiO 3 sample with spatially graded oxygen deficiencies, in which R 33.7 °-(√13 × √13), (2 × 1), and R 26.6°-(√5 × √5) surface reconstructions are observed while increasing the amount of oxygen deficiencies. This indicates that oxygen nonstoichiometry has an influence on the formation of various surface reconstructions as one of the important factors. This concept is also applicable to other transition metal oxides to prepare atomically ordered surfaces in a reproducible manner.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)