Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy

Ayako Tokiwa, Yasuhiko Syono, Masae Kikuchi, Reiko Suzuki, Tsuyoshi Kajitani, Norio Kobayashi, Takako Sasaki, Osamu Nakatsu, Yoshio Muto

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Abstract

The effects of Ca2+substitution for Y3+and La3+substitution for Ba2+in YBa2Cu3O7on the structural and superconducting properties were studied to control the average copper charge. Single-phase tripled perovskites were obtained for 0≦x≦0.2 and 0≦x≦1.0 for Ca and La doped series, respectively. A slight decrease of Tcwith increasing x was found for small x values for both kinds of substituted specimens prepared by furnace cooling in air. Oxygen annealing experiments were also carried out. These suggested that the superconduction in the Y-Ba-Cu-O system cannot be interpreted only by oxygen content or average copper charge.

Original languageEnglish
Pages (from-to)L1009-L1012
JournalJapanese Journal of Applied Physics
Volume27
Issue number6A
DOIs
Publication statusPublished - 1988 Jun

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Keywords

  • Oxygen annealing
  • Substitution effect
  • Superconducting oxide
  • Thermal analysis
  • Y1_xCai Ba7Cu30K
  • YBa2_xLaxCu30K

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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