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Suppression of vacancy defects in epitaxial La-doped SrTiO3 films

Suppression of vacancy defects in epitaxial La-doped SrTiO3 films

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Authors

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

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Original languageEnglish
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Pages-
Number of pages3
JournalApplied Physics Letters
Journal publication date5 Dec 2011
Journal number23
Volume99
DOIs
StatePublished

Abstract

Variable energy positron annihilation lifetime spectroscopy of high-mobility La-doped SrTiO3 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3664398]

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