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Title: Vacancy related defects in La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films

Abstract

Laser ablated La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films have been studied by Doppler-broadening-detected positron annihilation using a variable-energy positron beam. The oxygen partial pressure during cooling from the growth temperature was altered through the range 760 torr to 10{sup -5} torr to change the oxygen non-stoichiometry of the films. The measured Doppler broadened lineshape parameter S was found to increase with increasing oxygen nonstoichiometry. For films cooled with an oxygen partial pressure of {le} 10{sup -4} Torr positron trapping to monovacancy type defects is inferred. For the film cooled in 10{sup -5} torr oxygen the magnitude of the increase in S, with respect to that measured from the film cooled in 760 Torr oxygen, showed positron trapping to vacancy cluster defects was occurring.

Authors:
 [1];  [2];  [3]
  1. Univ. of Dundee (United Kingdom). Carnegie Lab. of Physics
  2. Michigan Technological Univ., Houghton, MI (United States). Dept. of Physics
  3. Brookhaven National Lab., Upton, NY (United States); and others
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
475599
Report Number(s):
BNL-64278; CONF-961202-109
ON: DE97006100; TRN: 97:003277
DOE Contract Number:  
AA03-78CH00017
Resource Type:
Conference
Resource Relation:
Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; VACANCIES; STRONTIUM OXIDES; COBALT OXIDES; DOPPLER BROADENING; THIN FILMS; PEROVSKITES

Citation Formats

Keeble, D J, Krishnan, A, and Nielsen, B. Vacancy related defects in La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films. United States: N. p., 1996. Web.
Keeble, D J, Krishnan, A, & Nielsen, B. Vacancy related defects in La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films. United States.
Keeble, D J, Krishnan, A, and Nielsen, B. Tue . "Vacancy related defects in La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films". United States. https://www.osti.gov/servlets/purl/475599.
@article{osti_475599,
title = {Vacancy related defects in La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films},
author = {Keeble, D J and Krishnan, A and Nielsen, B},
abstractNote = {Laser ablated La{sub 0.5}Sr{sub 0.5}CoO{sub 3-{delta}} thin films have been studied by Doppler-broadening-detected positron annihilation using a variable-energy positron beam. The oxygen partial pressure during cooling from the growth temperature was altered through the range 760 torr to 10{sup -5} torr to change the oxygen non-stoichiometry of the films. The measured Doppler broadened lineshape parameter S was found to increase with increasing oxygen nonstoichiometry. For films cooled with an oxygen partial pressure of {le} 10{sup -4} Torr positron trapping to monovacancy type defects is inferred. For the film cooled in 10{sup -5} torr oxygen the magnitude of the increase in S, with respect to that measured from the film cooled in 760 Torr oxygen, showed positron trapping to vacancy cluster defects was occurring.},
doi = {},
url = {https://www.osti.gov/biblio/475599}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

Conference:
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