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

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

doi:10.1063/1.3664398

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

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

Materials Research Science & Engineering Center

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

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.

Original language	English (US)
Article number	232905
Journal	Applied Physics Letters
Volume	99
Issue number	23
DOIs	https://doi.org/10.1063/1.3664398
State	Published - 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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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.",

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AU - Egger, W.

AU - Kanda, G.

AU - Stemmer, S.

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