Superconducting properties of Dy-Ba-Cu-O bulk superconductors

S. Nariki, M. Murakami

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We report on the superconducting properties of melt-textured Dy 123 bulk superconductors containing 5 to 40 mol% Dy211. Dy-Ba-Cu-O bulk samples were fabricated with the cold-seeding method in air using a Nd123 seed crystal. The superconducting properties of the bulk samples were strongly affected by the Dy211 content and the oxygen-annealing temperature. In the Jc-B curve of the Dy123 sample with 5 mol% of Dy211, the secondary peak was clearly observed at the applied fields of 0.5-2.0 T. The peak Jc values were 32 000-37 000 A cm-2 at 77 K. The peak position shifted to lower fields with increasing oxygen-annealing temperature, presumably due to an increase in oxygen vacancies. We believe that the peak effect in Dy-Ba-Cu-O is ascribed to oxygen deficiency, since RE/Ba substitution is not present in the system. This idea was supported by the fact that the secondary peak decreased with increasing Dy211 contents and disappeared in the Dy123 sample with 40 mol% of Dy211.

Original languageEnglish
Pages (from-to)786-790
Number of pages5
JournalSuperconductor Science and Technology
Volume15
Issue number5
DOIs
Publication statusPublished - 2002 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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