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

doi:10.1103/PhysRevB.87.195409

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

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

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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 language	English
Article number	195409
Number of pages	11
Journal	Physical Review B: Condensed matter and materials physics
Volume	87
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevB.87.195409
Publication status	Published - 2013

Keywords

SYSTEM
PULSED-LASER DEPOSITION

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10.1103/PhysRevB.87.195409

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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.",

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T1 - Nonstoichiometry accommodation in SrTiO3 thin films studied by positron annihilation and electron microscopy

AU - Keeble, D. J.

AU - Wicklein, S.

AU - Jin, L.

AU - Jia, C. L.

AU - Egger, W.

AU - Dittmann, R.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

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KW - PULSED-LASER DEPOSITION

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VL - 87

JO - Physical Review B: Condensed matter and materials physics

JF - Physical Review B: Condensed matter and materials physics

IS - 19

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ER -

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

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Keywords

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