Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 31: Oxide and Insulator Surfaces: Structure, Epitaxy and Growth I
O 31.8: Vortrag
Dienstag, 21. März 2017, 12:15–12:30, WIL C107
Ordered structures in reduced SrTiO3 on Pd(111) — •Bettina Leibundgut1, Stefan Förster1, and Wolf Widdra1,2 — 1Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany
Ultrathin perovskite films exhibit extraordinary complex structures on Pt(111) in the two-dimensional limit. Upon reduction by UHV annealing, two-dimensional oxide quasicrystal or closely related periodic approximant structures have been reported for BaTiO3 and SrTiO3 on Pt(111) [1-3].
Here we report on the formation of similarly complex structures from SrTiO3 on Pd(111).
The films are grown by reactive molecular beam epitaxy from a Nb-doped SrTiO3 single crystal and a Ti rod. For Ti rich growth conditions, a phase separation in TiOx and SrO occurs upon annealing at 950 K. This is deduced from SPALEED observation of the rectangular phase of reduced TiOx on Pd(111), which is well-known for Pt(111) [4]. When approaching stoichiometric SrTiO3 films, several large unit cell superstructures are observed, that will be discussed with respect to aperiodic structures.
S. Förster K. Meinel, R. Hammer, M. Trautmann, W. Widdra, Nature 502, 215 (2013)
[2] S. Förster et al., Phys. Rev. Lett. 117, 095501 (2016)
[3] S. Schenk et al., submitted to J. Phys: Condens. Matter
[4] F. Sedona et al., J. Phys. Chem. B 7, 697 (2005).