High critical current density in RE-Ba-Cu-O bulk superconductors with very fine RE2BaCuO5 particles

S. Nariki, Naomichi Sakai, Masato Murakami, I. Hirabayashi

Research output: Contribution to journalArticle

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Abstract

We have studied the microstructure and critical current density (J c) of Gd-Ba-Cu-O and Y-Ba-Cu-O bulk superconductors. The size of RE2BaCuO5 (RE211) particles trapped in REBa 2Cu3Oy (RE123) matrix could be refined by employing ultra-fine RE211 powder as a precursor, which led to high J c values exceeding 1 × 105 A/cm2 at 77 K in self-field for Gd-Ba-Cu-O. In the case of Y-Ba-Cu-O, however, the size reduction of Y211 led to inhomogeneous distribution of Y211 particles, in that the volume fraction of Y211 phase largely decreased near a seed crystal. We also studied superconducting properties of (Gd,Y)-Ba-Cu-O bulk material fabricated from precursor of Gd123-Y211. The employment of finely-milled Y211 powders resulted in a dramatic enhancement of Jc values in this system. The maximum Jc value for (Gd,Y)-Ba-Cu-O reached 2.5×105 A/cm2 at 77 K.

Original languageEnglish
Pages (from-to)557-565
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct

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Powders
Superconducting materials
critical current
current density
trapped particles
seeds
Volume fraction
Crystals
microstructure
Microstructure
augmentation
matrices
crystals

Keywords

  • Critical current density
  • Melt-textured bulk
  • Microstructure Gd-Ba-Cu-O
  • Y-Ba-Cu-O

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

High critical current density in RE-Ba-Cu-O bulk superconductors with very fine RE2BaCuO5 particles. / Nariki, S.; Sakai, Naomichi; Murakami, Masato; Hirabayashi, I.

In: Physica C: Superconductivity and its Applications, Vol. 412-414, No. SPEC. ISS., 10.2004, p. 557-565.

Research output: Contribution to journalArticle

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