Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 135, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3613637
Keywords
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Funding
- Autonomous Region of Sardinia through Promoting scientific research and innovation technology in Sardinia
- European Union [FP7/2007-2013, 264098-MAMA]
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We report on a systematic study of the growth of epitaxial TiO2 films deposited by pulsed laser deposition on Ti-terminated SrTiO3 (001) single crystals. By using in situ reflection high energy electron diffraction, low energy electron diffraction, x-ray photoemission spectroscopy, and scanning probe microscopy, we show that the stabilization of the anatase (001) phase is preceded by the growth of a few nanometers thick pseudomorphic SrxTiO2+y (x, y < 1) intermediate layer. The data demonstrate that the formation of this intermediate phase is related to the activation of a long range Sr migration from the SrTiO3 substrate into the film. Our results enrich the phase diagram of the Sr-Ti-O system under epitaxial strain opening a route for the study of the electronic and dielectric properties of the reported Sr-deficient SrTiO3 phase. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3613637]
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