Perfect fits of Jc-B dependencies in NEG-123 bulk samples with 30% Gd-211 fine particles

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Abstract

Magnetization hysteresis loops (MHL) were measured on two NEG-123 bulk samples with addition of 30% Gd-211 fine (sub-micron) particles in the temperature range 65-88 K. These two samples possessed significantly different second-to-central peak heights ratios. Both sets of the Jc-B curves could be, however, fitted with a high precision by the same combined analytical function Jc(B) = Jcpexp(-αB/Bp) + Jspbp exp[(1 - (B/Bp)n)/n] in all investigated temperatures. The pinning regimes governing formation of the central and second peak could be separated in this way. As far as the central peak contribution to the MHL becomes usually negligible at around Bp, the shape of Jc(B) above Bp is governed by only a high-field pinning mechanism. The central peak extends to this field region only at temperatures very close to Tc. Good scaling of the pinning force density with temperature gives a further support to the above conclusions.

Original languageEnglish
Pages (from-to)489-493
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume357-360
DOIs
Publication statusPublished - 2001 Aug

Keywords

  • (Nd, Eu, Gd)BaCuO
  • Critical currents
  • Melt-textured materials
  • Scaling
  • Vortex physics

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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