High temperature electrical properties and defect chemistry of La2-xCaxCuO4-y superconductors - I. Electrical properties

Li Shen, Paul A. Salvador, Thomas O Mason

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The thermoelectric power and electrical conductivity of La2-xCaxCuO4-y superconductors were measured for doping levels, x = 0-0.16, under oxygen partial pressures, P(O2) = 1-10-5 atm, at temperatures, T = 700-1000°C. Despite the reported difference in their oxygen nonstoichiometry behavior, the observed electrical properties of Ca-doped La2CuO4 are similar to those of Ba-and Sr-doped La2CuO4. The solubility limit was determined to be within x = 0.10-0.12, from XRD and electrical measurements. The conduction mechanism has been identified as band-type conduction for x > 0 and as either band-type or small polaron conduction for x = 0. An apparent band gap of 0.74 eV (band conduction) or 1.11 eV (small polaron) was obtained for La2CuO4 at 800°C.

Original languageEnglish
Pages (from-to)1311-1319
Number of pages9
JournalJournal of Physics and Chemistry of Solids
Volume57
Issue number9
DOIs
Publication statusPublished - Sep 1996

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Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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