Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 14: Clean surfaces: Metals, semiconductors, oxides and insulators I

O 14.6: Talk

Monday, March 14, 2011, 16:15–16:30, WIL B122

Formation and coexistence of different surface structures on heavily reduced TiO2 (110) rutile surface: STM/STS study. — •Pavel Shukrynau, Marius Toader, Lars Smykalla, and Michael Hietschold — Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany

Cycles of Ar+ ion bombardment followed by specific temperature treatment leads to the formation and coexistence of two different phases onto single crystal TiO2 (110) rutile surface. One of the observed reconstructions is somehow similar to that cross-linked (1x2)-TiO2 structure, where the cross-link chains are perpendicular to the added rows of Ti2O3. In contrast, we observe cross-links that are rotated to 45° with respect to the <001> direction of the rows. This uncommon formation of the cross-link chains could be explained by the rearrangement of the top atoms at certain temperatures. STM topographs taken over the neighboring phase show bright rows, that run in <110> direction. Close inspection of the filled and empty images reveals zigzag arrangement of the bright protrusions within the particular line. Tunneling spectra acquired over various sites in the topographic image give the information about the bonding nature within the reconstruction. We propose the possible structural models of the coexisting phases and discuss their formation mechanisms on the base of atomically resolved STM images that were taken in both constant current and constant height modes.