Journal Article

PreJuSER-12079

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Identification of A- and B-site cation vacancy defects in perovskite oxide thin films

Keeble, D. J. ; Wicklein, S.FZJ* ; Dittmann, R.FZJ* ; Ravelli, L. ; Mackie, R. A. ; Egger, W.

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7259  doi:10.1103/PhysRevLett.105.226102

Abstract: Cation vacancies on both sublattices (V-Ti, V-Sr) have been identified in homoepitaxial pulsed laser deposited SrTiO3 films using high intensity variable energy positron annihilation lifetime spectroscopy (PALS) measurements. Film nonstoichiometry was varied by varying laser fluence. PALS showed that on increasing the fluence above the Ti/Sr similar to 1 value, the concentration ratio [V-Sr]/[V-Ti] systematically increased. Reducing the fluence into the Ti-poor region below resulted in additional vacancy cluster defect formation. Vacancy concentrations greater than similar to 50 ppm were observed in all films.

Keyword(s): J

Note: D. J. K. acknowledges European Commission Programme RII3-CT-2003-505925. We thank C. Hugenschmidt for providing the NEUPOMUC beam line. D. J. K. thanks I. Makkonen, Helsinki University of Technology, for MIKA/DOPPLER support.

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Contributing Institute(s):

1. Elektronische Materialien (IFF-6)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Experiment(s):

1. NEPOMUC: Neutron induced positron source munich (SR11)

Appears in the scientific report 2010
Notes: Nachtrag

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