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; Valery Petrykin; Minoru Osada; Masato Kakihana; Yoshito Tanaka; Ai Yamaguchi; Takahiro Katsumata; Hiroshi Yasuoka

doi:10.2497/jjspm.48.1147

Synthesis and Characterization of (Ca_xLa_1-x)(Ba_1.75-xLa_0.25+x)Cu₃O_7+δ Tetragonal Superconductor by an Aqueous Solution Technique Using Citric Acid

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

Author information

Yasushi Sato
Materials and Structures Laboratory, Tokyo Institute of Technology
Kohtaro Yoshioka
Materials and Structures Laboratory, Tokyo Institute of Technology
Valery Petrykin
Materials and Structures Laboratory, Tokyo Institute of Technology
Minoru Osada
Materials and Structures Laboratory, Tokyo Institute of Technology
Masato Kakihana
Materials and Structures Laboratory, Tokyo Institute of Technology
Yoshito Tanaka
Depertament of Applied Physics, The National Defense Academy
Ai Yamaguchi
Depertament of Applied Physics, The National Defense Academy
Takahiro Katsumata
Depertament of Applied Physics, The National Defense Academy
Hiroshi Yasuoka
Depertament of Applied Physics, The National Defense Academy

Keywords: cuprate superconductor, Raman scattering, amorphous citric acid method, gel, carrier concentration, doping, sintering condition

JOURNAL OPEN ACCESS

2001 Volume 48 Issue 12 Pages 1147-1151

DOI https://doi.org/10.2497/jjspm.48.1147

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Abstract

Polycrystalline samples of (Ca_xLa_1-x)(Ba_1.75-xLa_0.25+x)Cu₃O_7+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.

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