LEED-IV study of the rutile Ti O 2 ( 110 ) − 1 × 2 surface with a Ti-interstitial added-row reconstruction
2007; American Physical Society; Volume: 75; Issue: 8 Linguagem: Inglês
10.1103/physrevb.75.081402
ISSN1550-235X
AutoresM. Blanco-Rey, J.-A. Abad, Celia Rogero, Javier Méndez, María Francisca López, E. Román, José Á. Martín‐Gago, P. L. de Andrés,
Tópico(s)Electron and X-Ray Spectroscopy Techniques
ResumoUpon sputtering and annealing in UHV at $\ensuremath{\sim}1000\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the rutile $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ surface undergoes a $1\ifmmode\times\else\texttimes\fi{}1\ensuremath{\rightarrow}1\ifmmode\times\else\texttimes\fi{}2$ phase transition. The resulting $1\ifmmode\times\else\texttimes\fi{}2$ surface is Ti rich, formed by strands of double Ti rows as seen on scanning tunneling microscopic images, but its detailed structure and composition have been subject to debate in the literature for years. Recently, Park et al. [Phys. Rev. Lett. 96, 226105 (2006)] have proposed a model where Ti atoms are located on interstitial sites with ${\mathrm{Ti}}_{2}\mathrm{O}$ stoichiometry. This model, when it is analyzed using LEED-IV data [Phys. Rev. Lett. 96, 0055502 (2006)], does not yield an agreement between theory and experiment as good as the previous best fit for Onishi and Iwasawa's model for the long-range $1\ifmmode\times\else\texttimes\fi{}2$ reconstruction. Therefore, the ${\mathrm{Ti}}_{2}{\mathrm{O}}_{3}$ added row is the preferred one from the point of view low-energy electron diffraction.
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