Abstract
We have fabricated the ternary (Nd, Eu, Gd)Ba2Cu3Oy system with various Nd:Eu:Gd ratios with the aim of optimizing the pinning performance at 77 K. The magnetization measurements suggest that the three elements (Nd, Eu, Gd) contribute to pinning in different manners: Nd mainly enhances flux pinning at low magnetic fields, Eu controls the second peak position and the irreversibility field, while Gd slightly enhances intermediate and high-field Jc values. The scaling analysis of the pinning force density versus the reduced field h = Ha/Hirr showed a peak at h = 0.55. This value is higher than the theoretically predicted highest value of h = 0.5, corresponding to ΔTc pinning. We proved that an excellent flux pinning can be achieved in the entire magnetic field range when sub-micron secondary phase particles are dispersed in the NEG-123 matrix with an optimum Nd:Eu:Gd ratio.
Original language | English |
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Pages (from-to) | 688-693 |
Number of pages | 6 |
Journal | Superconductor Science and Technology |
Volume | 15 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2002 May 1 |
Externally published | Yes |
ASJC Scopus subject areas
- Ceramics and Composites
- Condensed Matter Physics
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry