TY  - JOUR
AU  - Keeble, D.J.
AU  - Wicklein, S.
AU  - Dittmann, R.
AU  - Ravelli, L.
AU  - Mackie, R.A.
AU  - Egger, W.
TI  - Identification of A- and B-site cation vacancy defects in perovskite oxide thin films
JO  - Physical review letters
VL  - 105
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-12079
SP  - 226102
PY  - 2010
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000284532900018
DO  - DOI:10.1103/PhysRevLett.105.226102
UR  - https://juser.fz-juelich.de/record/12079
ER  -