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Publications in Scientific Journals:

S. Gerhold, Z. Wang, M. Schmid, U. Diebold:
"Stoichiometry-driven switching between surface reconstructions on SrTiO3(001)";
Surface Science, 621 (2014), 1 - 4.



English abstract:
Controlling the surface structure on the atomic scale is amajor 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, lowenergy
He+ ion scattering (LEIS), and X-ray photoelectron spectroscopy (XPS). Vapor deposition of 0.8monolayer
(ML) strontium and 0.3 ML titanium, with subsequent annealing to 850 C in 4 10−6 mbar 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.

Keywords:
Scanning tunneling microscopy Low energy electron diffraction Low energy ion scattering X-ray photoelectron spectroscopy Surface stoichiometry Strontium titanate

Created from the Publication Database of the Vienna University of Technology.