Synthesis of (CaxLa1.00-x)(Ba1.75-xLa0.25+x)Cu 3Oz tetragonal superconductor by amorphous metal complex method

Yasushi Sato, Valery Petrykin, Masato Kakihana*, Minoru Osada, Ai Yamaguchi, Shinjiro Tochihara, Yoshito Tanaka, Hiroshi Yasuoka, Hiromasa Mazaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Polycrystalline samples of tetragonal superconducting (CaxLa1.00-x)(Ba1.75-xLa0.25+x)Cu 3Oz isostructural to YBa2Cu3O7-δ were prepared by a simple aqueous solution technique using citric acid (CA). The results of both X-ray diffraction (XRD) and Raman scattering analyses indicated that the polycrystalline samples for the Ca content (x) from 0.1 to 1.0 were of single phase with respect to superconductivity and isostructural to tetragonal YBa2Cu3O7-δ phase. The dependence of Tc onset values for (x) from 0.1 to 1.0, determined precisely from the ac complex magnetic susceptibility measurements, had a "bell-shaped" character. The values increased from 39.6 K for x = 0.1 to 78.7 K for x = 0.4, remained almost constant at 80 K between x = 0.5 and x = 0.6, and then decreased to 44.6 K for x = 1.0.

Original languageEnglish
Pages (from-to)299-304
Number of pages6
JournalSolid State Ionics
Issue number1-4
Publication statusPublished - 2002 Nov
Externally publishedYes


  • (CaLa)(BaLa) CuO
  • Ac complex susceptibility
  • Amorphous citrate method
  • Raman scattering

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics


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