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

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)127-135
ページ数9
ジャーナルPhysica C: Superconductivity and its applications
402
1-2
DOI
出版ステータスPublished - 2004 2 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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