Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 56: Oxide Surfaces I
O 56.1: Talk
Wednesday, March 13, 2013, 16:00–16:15, H45
scanning tunneling microscopy study of single-crystalline Sr3Ru2O7 — •Bernhard Stöger1, Zhiming Wang1, Marcel Hieckel1, Florian Mittendorfer1, Raimund Podloucky2, Josef Redinger1, David Fobes3, Zhiqiang Mao3, Michael Schmid1, and Ulrike Diebold1 — 1Institute of Applied Physics, Vienna University of Technology, Vienna, Austria — 2Institute for Physical Chemistry, University of Vienna, Austria — 3Department of Physics and Engineering Physics, Tulane University, New Orleans, LA, USA
Investigating surface defects such as oxygen vacancies and the adsorption of relevant molecules helps gaining more insight into the physics behind solid oxide fuel cells and catalytic processes.
High-quality Sr3Ru2O7 (SRO) single crystals were grown using the floating zone technique. The SRO samples were cleaved at 100 K under UHV conditions and subsequently investigated by STM at 78 K and 6 K. To determine which species are imaged in STM, doped SRO samples were investigated and STM simulations were performed. Furthermore, we have characterized the defects that are present at the as-cleaved surfaces, and how reactive they are if exposed to CO, O2 and CO2.
CO adsorbs on the perfect surface at the position of the apical oxygen atom. The adsorbed CO can be easily manipulated by the STM tip. At +1 V a reaction takes place which changes the appearance of the adsorbed CO drastically. At +2.7 V the CO molecules start to diffuse on the surface and to desorb. This work was supported by the Austrian Science Fund (FWF project F45).