Flux pinning and superconducting properties of ZnO added (Nd,Eu,Gd)Ba2Cu3Oy

M. Muralidhar, N. Sakai, M. Jirsa, T. Kono, M. Murakami, I. Hirabayashi

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The paper provides an experimental basis for preparing large grain (Nd0.33Eu0.27Gd0.39)Ba2 Cu3Oy "NEG-123". MgO seeds proved to be efficient in controlling growth orientation when a small quantity of ZnO of around 0.035 wt.% was added to the NEG-123 matrix. A substantial reduction of liquid phase loss was observed for a proper ZnO concentration. A perfect facet line up to the bottom of the sample with c-axis reflection plane was observed after the melt-growth implying high density of the material and practically no liquid loss. The magnetization measurements suggested that the superconducting transition temperatures were not affected up to 0.035 wt.% ZnO addition. Critical current density Jc, measured at 3 T and 77 K (Ha∥c-axis), increased with increasing ZnO content up to 0.035 wt.%, where it reached maximum value of 100 kA/cm2 and decreased thereafter. The scalling analysis of the pinning force density as a function of the reduced field h = Ha/Hirr (Hirr is the irreversibility field) showed a peak at relatively high position as expected for an optimized pinning structure. The present results indicate high potential of ZnO particles for further enhancement of the material performance.

本文言語English
ページ(範囲)403-407
ページ数5
ジャーナルPhysica C: Superconductivity and its applications
445-448
1-2
DOI
出版ステータスPublished - 2006 10 1

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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