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 language | English (US) |
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Pages (from-to) | 1977-1987 |
Number of pages | 11 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 57 |
Issue number | 12 |
DOIs | |
State | Published - Dec 1996 |
Keywords
- A. superconductors
- D. defects
- D. electrical properties
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics