Effect of matrix composition on the flux pinning in a (Nd, Eu, Gd)Ba2Cu3Oy superconductor

M. Muralidhar, M. Murakami

研究成果: Article査読

59 被引用数 (Scopus)


In order to study the effect of matrix composition on flux pinning in the (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) bulk superconductors, we prepared two groups of samples with various rare-earth (RE) ratios using the oxygen-controlled-melt-growth (OCMG) process. For the first group, we kept the Nd content constant and varied the Eu/Gd ratio, and for the second group the Gd content was kept constant and the Nd/Eu ratio was varied. All the samples exhibited strongly developed fishtail effects and high critical current densities. Magnetization measurements revealed that the irreversibility field and the peak position systematically varied with Nd and Gd content. Scaling analyses suggested that two different pinning mechanisms are active in the NEG-123 system depending on the RE ratio. Those are ΔTc pinning and normal-type pinning, however, we found that field-induced pinning also behaves like normal-type pinning on scaling analyses when ΔTc is large. In conclusion, a difference in the peak position on scaled curves can be explained in terms of a difference in ΔTc of field-induced pinning centers.

ジャーナルPhysical Review B - Condensed Matter and Materials Physics
出版ステータスPublished - 2000 12月 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


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