High temperature electrical properties and defect chemistry of La2-xCaxCuO4-y superconductors - II. Defect structure modeling

Li Shen*, Paul Salvador, Thomas O Mason, Kazuo Fueki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The defect structure of La2-xCaxCuO4-y superconductors was examined by fitting electrical property and oxygen nonstoichiometry data to a variety of models. Those involving charged oxygen vacancies, whether isolated or associated, were inadequate for simultaneously describing the dependence of both properties on doping level and oxygen partial pressure. Neutral oxygen vacancies and their association with dopants were invoked, resulting in a successful reconciliation of all existing experimental data. The defect types and configurations can be rationalized in terms of the bond-mismatch between the (LaO)2 and CuO2 layers in the La2CuO4 structure. The defect associates proposed may be responsible for the suppression in Tc relative to the La2-xBaxCuO4-y and La2-xSrxCuO4-y systems.

Original languageEnglish (US)
Pages (from-to)1977-1987
Number of pages11
JournalJournal of Physics and Chemistry of Solids
Volume57
Issue number12
DOIs
StatePublished - Jan 1 1996

Keywords

  • A. superconductors
  • D. defects
  • D. electrical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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