Melt processing of high-Tc Nd-Ba-Cu-O superconductors in air

H. Kojo, S. I. Yoo, Masato Murakami

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Abstract

We have succeeded in fabricating Nd-Ba-Cu-O bulk superconductors, which exhibit high Tc and a sharp superconducting transition, by the melt process in air without additional high temperature annealing in a reduced oxygen atmosphere. The key to this achievement is the use of Ba-rich Nd4-2zBa2+2zCu2-zO10-δ as a precursor. Fabricated bulk samples exhibit onset Tc values of 94-95 K and the secondary peak effect in the M-H loop like the case of Nd-Ba-Cu-O superconductors produced by melt processing in a reduced oxygen atmosphere. The peak position and the irreversibility field for the best sample were about 1.2 T and 5 T at 77.3 K, respectively, and the estimated Jc at the peak field was about 2.3 × 104 A cm-2.

Original languageEnglish
Pages (from-to)85-88
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume289
Issue number1-2
Publication statusPublished - 1997 Aug 15
Externally publishedYes

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Keywords

  • Critical current density
  • Melt process
  • Nd-ba-cu-o
  • Phase diagram
  • Solid solution
  • Superconductor

ASJC Scopus subject areas

  • Condensed Matter Physics

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