Vacancy defect positron lifetimes in strontium titanate

R. A. MacKie, S. Singh, J. Laverock, S. B. Dugdale, D. J. Keeble

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    Abstract

    The results of positron-annihilation lifetime spectroscopy measurements on undoped, electron-irradiated, and Nb-doped SrTiO3 single crystals are reported. Perfect lattice and vacancy defect positron lifetimes were calculated using two different first-principles schemes. The Sr-vacancy defect-related positron lifetime was obtained from measurements on Nb-doped, electron-irradiated, and vacuum-annealed samples. Undoped crystals showed a defect lifetime component dominated by trapping to Ti vacancy-related defects.

    Original languageEnglish
    Article number014102
    Pages (from-to)-
    Number of pages8
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume79
    Issue number1
    DOIs
    Publication statusPublished - 2009

    Keywords

    • ab initio calculations
    • niobium compounds
    • positron annihilation
    • strontium compounds
    • vacancies (crystal)
    • LA-DOPED SRTIO3
    • DIELECTRIC-PROPERTIES
    • ELECTRONIC-STRUCTURE
    • GRADIENT-CORRECTION
    • SINGLE-CRYSTALS
    • THIN-FILMS
    • CERAMICS
    • ANNIHILATION
    • SOLIDS
    • CHEMISTRY

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