Synthesis and characterization of (CaxLa1-x)(Ba1.75-xLa0.25+x) Cu3O7+δ tetragonal superconductor by an aqueous solution technique using citric acid

Yasushi Sato*, Kohtaro Yoshioka, Minoru Osada, Valery Petrykin, Masato Kakihana, Yoshito Tanaka, Ai Yamaguchi, Takahiro Katsumata, Hiroshi Yasuoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Polycrystalline samples of (CaxLa1-x) (Ba1.75-xLa0.25+x)Cu3O7+δ tetragonal superconductor for Ca content (x) from 0.0 to 0.6 were synthesized by a simple aqueous solution technique using citric acid. The combined results of X-ray diffraction and Raman scattering analysis indicated that the polycrystalline samples for the entire Ca content (x) were of single-phase character. The Tc onset values for (x) from 0.0 to 0.6, determined precisely from the complex magnetic susceptibility measurements, increased from 45.0 K for x=0.0 to 78.7 K for x=0.4, remained almost constant at 80 K between x=0.5 and x=0.6. It was also found that sintering condition affected rather dramatically superconducting properties in this system.

Original languageEnglish
Pages (from-to)1147-1151
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number12
Publication statusPublished - 2001 Dec
Externally publishedYes


  • Amorphous citric acid method
  • Carrier concentration
  • Cuprate superconductor
  • Doping
  • Gel
  • Raman scattering
  • Sintering condition

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys


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