Nonstoichiometry accommodation in SrTiO3 thin films studied by positron annihilation and electron microscopy

D. J. Keeble, S. Wicklein, L. Jin, C. L. Jia, W. Egger, R. Dittmann

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    Abstract

    Accommodation of nonstoichiometry in SrTiO3 pulsed laser deposited (PLD) films was investigated using positron annihilation lifetime spectroscopy and (scanning) transmission electron microscopy. Increasing PLD laser fluence changed the stoichiometry from Ti to Sr deficient. Cation vacancy defects were detected, and the concentration ratio of Sr to Ti vacancies, [V-Sr]/[V-Ti], was observed to increase systematically in the Sr-deficient region, although no change in the electron microscopy lattice images was detected. Increasing Ti deficiency resulted in the accommodation of SrO layers in planar defects, and in the formation of vacancy cluster defects. A change from VTi to VSr defect positron trapping was also detected.

    Original languageEnglish
    Article number195409
    Number of pages11
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume87
    Issue number19
    DOIs
    Publication statusPublished - 2013

    Keywords

    • SYSTEM
    • PULSED-LASER DEPOSITION

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