Superconductors and nonsuperconductors in Nd2-χCeχCuO4

D. J. Li*, J. P. Zhang, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Results are presented on the chemical composition and structure of the n-type superconductors Nd2-χCeχCuO4. Electron diffraction and high resolution electron microscopy indicate that there are three slightly different structures, two of which are modulated versions of the first. By matching both the images and diffraction patterns it is shown that the modulations are due to small displacements of the cations, possibly a charge density wave, not simply ordering of the Ce or oxygen vacancies, although oxygen stoichiometry may be the driving force for the modulations. Both types of phases occur in materials which are superconducting, and those which are not. Microanalysis indicates that the Ce content of the superconducting specimens after reduction is slightly smaller at 0.16 rather than 0.19, and the cation stoichiometry is not detectably different between the modulation and unmodulated materials.

Original languageEnglish (US)
Pages (from-to)617-626
Number of pages10
JournalPhysica C: Superconductivity and its applications
Volume168
Issue number5-6
DOIs
StatePublished - Jul 1 1990

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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