title: Stoichiometry-driven switching between surface reconstructions on SrTiO3(001).
abstract: Controlling the surface structure on the atomic scale is a major difficulty for most transition metal oxides; this is especially true for the ternary perovskites. The influence of surface stoichiometry on the atomic structure of the SrTiO3(001) surface was examined with scanning tunneling microscopy, low-energy electron diffraction, low-energy He+ion scattering (LEIS), and X-ray photoelectron spectroscopy (XPS). Vapor deposition of 0.8 monolayer (ML) strontium and 0.3 ML titanium, with subsequent annealing to 850 °C in 4 × 10- 6mbar O2, reversibly switches the surface between c(4 × 2) and (2 × 2) reconstructions, respectively. The combination of LEIS and XPS shows a different stoichiometry that is confined to the top layer. Geometric models for these reconstructions need to take into account these different surface compositions.
authors.affiliation: Institute of Applied Physics, Vienna University of Technology, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Gerhold
authors.affiliation: Institute of Applied Physics, Vienna University of Technology, Austria.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Institute of Applied Physics, Vienna University of Technology, Austria.
authors.forename: Michael
authors.initials: M
authors.lastname: Schmid
authors.affiliation: Institute of Applied Physics, Vienna University of Technology, Austria.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Diebold
keywords: Low energy electron diffraction; Low energy ion scattering; Scanning tunneling microscopy; Strontium titanate; Surface stoichiometry; X-ray photoelectron spectroscopy
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