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Title: Vacancy defects in thin-film La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} observed by positron annihilation

Abstract

Vacancy-related defects in laser ablated thin films of the conducting metal{endash}oxide La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} were detected using a variable-energy positron beam. The nonstoichiometry, {delta}, was altered by varying the oxygen partial pressure within the deposition chamber present during cooling. Conductivity measurements confirmed the change in oxygen content. Increased positron trapping at vacancy defects was observed with increasing nonstoichiometry. It is proposed that vacancy clusters were present in the film cooled in 10{sup {minus}5}thinspTorr oxygen. {copyright} {ital 1998 American Institute of Physics.}

Authors:
 [1]; ; ;  [2]; ; ;  [3];  [4]
  1. Carnegie Laboratory of Physics, University of Dundee, Dundee DD1 4HN (United Kingdom)
  2. Division of Materials Science, Brookhaven National Laboratory, Upton, New York 11793 (United States)
  3. Department of Materials Science and Nuclear Engineering, University of Maryland, College Park, Maryland 20742 (United States)
  4. Army Research Laboratory, Adelphi, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
639050
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 73; Journal Issue: 4; Other Information: PBD: Jul 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; LANTHANUM COMPOUNDS; STRONTIUM COMPOUNDS; ELECTRIC CONDUCTIVITY; PEROVSKITES; LANTHANUM OXIDES; STRONTIUM OXIDES; COBALT OXIDES; THIN FILMS; CRYSTAL DEFECTS; VACANCIES; POSITRON BEAMS; STOICHIOMETRY

Citation Formats

Keeble, D J, Krishnan, A, Friessnegg, T, Nielsen, B, Madhukar, S, Aggarwal, S, Ramesh, R, and Poindexter, E H. Vacancy defects in thin-film La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} observed by positron annihilation. United States: N. p., 1998. Web. doi:10.1063/1.121916.
Keeble, D J, Krishnan, A, Friessnegg, T, Nielsen, B, Madhukar, S, Aggarwal, S, Ramesh, R, & Poindexter, E H. Vacancy defects in thin-film La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} observed by positron annihilation. United States. https://doi.org/10.1063/1.121916
Keeble, D J, Krishnan, A, Friessnegg, T, Nielsen, B, Madhukar, S, Aggarwal, S, Ramesh, R, and Poindexter, E H. Wed . "Vacancy defects in thin-film La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} observed by positron annihilation". United States. https://doi.org/10.1063/1.121916.
@article{osti_639050,
title = {Vacancy defects in thin-film La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} observed by positron annihilation},
author = {Keeble, D J and Krishnan, A and Friessnegg, T and Nielsen, B and Madhukar, S and Aggarwal, S and Ramesh, R and Poindexter, E H},
abstractNote = {Vacancy-related defects in laser ablated thin films of the conducting metal{endash}oxide La{sub 0.5}Sr{sub 0.5}CoO{sub 3{minus}{delta}} were detected using a variable-energy positron beam. The nonstoichiometry, {delta}, was altered by varying the oxygen partial pressure within the deposition chamber present during cooling. Conductivity measurements confirmed the change in oxygen content. Increased positron trapping at vacancy defects was observed with increasing nonstoichiometry. It is proposed that vacancy clusters were present in the film cooled in 10{sup {minus}5}thinspTorr oxygen. {copyright} {ital 1998 American Institute of Physics.}},
doi = {10.1063/1.121916},
url = {https://www.osti.gov/biblio/639050}, journal = {Applied Physics Letters},
number = 4,
volume = 73,
place = {United States},
year = {1998},
month = {7}
}