Enhancement of critical current density in (Nd, Eu, Gd)-Ba-Cu-O superconductors

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Abstract

We have achieved a large critical current density (J(c)) of 70000 A/cm2 at 77 K in 2.3 T and a large irreversibility field exceeding 7 T at 77 K for the fields parallel to the c axis in (Nd, Eu, Gd)-Ba-Cu-O in which 40 mol% (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase particles are finely dispersed in the (Nd, Eu, Gd)Ba2Cu3O(y) matrix and prepared by the melt process under oxygen partial pressure of 0.1%. Microstructural observations clarified that Pt addition was effective in reducing the size of NEG211 second phase particles, which led to a dramatic increase in J(c). A clear secondary peak effect was observed in the magnetization curve, suggesting that field-induced pinning is active in parallel with the pinning by NEG211 particles.

Original languageEnglish
Pages (from-to)42-47
Number of pages6
JournalMaterials Science and Engineering B
Volume65
Issue number1
DOIs
Publication statusPublished - 1999 Oct 29
Externally publishedYes

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Keywords

  • (Nd, Eu, Gd)BaCuO
  • (Nd, Eu, Gd)BaCuOy
  • Critical current density
  • Melt process
  • Microstructure
  • Peak effect
  • Pt addition

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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