Air processing of ternary (Sm,Eu,Gd)Ba2Cu3O 7-δ superconductors with enhanced peak effects

A. Hu, N. Sakai, H. Zhou, K. Inoue, N. Chikumoto, M. Murakami

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

High quality (Sm,Eu,Gd)Ba2Cu3O7-δ single domain superconductors were grown in air with BaCuO2-x addition. The flux pinning was investigated with varying temperatures of Ar post-annealing and the Eu/Gd ratio in the initial composition. The amplitude of the peak effect displayed a peak when annealed at 925 °C in Ar while the irreversible field Birr keeping unchanged. Eu enrichment dramatically enhanced Birr and the peak field for the samples annealed at 925 °C in Ar. At 77 K Birr was higher than 9 T in (Sm0.33Eu0.44Gd0.22)Ba2Cu 3O7-δ. Structural characterization showed that the average size of (Sm,Eu,Gd)2BaCuO5 inclusions slightly decreased with increasing the Gd concentration. The scaling analysis and field dependence of superconducting transition evidenced a predominant δT c style pinning induced by local compositional fluctuation. The evolution of flux pinning was thus attributed to variable compositional fluctuation.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume402
Issue number1-2
DOIs
Publication statusPublished - 2004 Feb 1

Keywords

  • (Sm,Eu,Gd)BaCuO
  • Air processing
  • Compositional fluctuation
  • Peak effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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