Keeble, David J.; Jalan, B.; Ravelli, Luca; Egger, Werner; Kanda, Gurmeet S.; Stemmer, S.
Document type:
Zeitschriftenartikel / Journal Article
Title:
Suppression of vacancy defects in epitaxial La-doped SrTiO 3 films
Journal:
Applied Physics Letters
Volume:
99
Issue:
23
Year:
2011
Language:
Englisch
Abstract:
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.