Suppression of vacancy defects in epitaxial La-doped SrTiO 3 films

D. J. Keeble, B. Jalan, L. Ravelli, W. Egger, G. Kanda, S. Stemmer

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Variable energy positron annihilation lifetime spectroscopy of high-mobility La-doped SrTiO 3 grown by molecular beam epitaxy found that the films contained sufficiently low concentrations of Sr vacancies and vacancy cluster defects to allow the observation of positron annihilation events from the perfect lattice. This enabled the concentrations of charged cation vacancies to be estimated, and these were found to be at least an order of magnitude below the La-dopant concentrations.

Original languageEnglish (US)
Article number232905
JournalApplied Physics Letters
Issue number23
StatePublished - Dec 5 2011

Bibliographical note

Funding Information:
D.J.K. acknowledges European Commission Programme RII3-CT-2003-505925. We thank C. Hugenschmidt for providing the NEUPOMUC beamline. B.J. and S.S. were supported through the U.S. National Science Foundation (Grant No. DMR-1006640).


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