Pinning characteristics in multifilamentary NbTi superconducting wires with submicrometre filaments introduced artificial pinning centres

O. Miura, K. Matsumoto, Y. Tanaka, K. Yamafuji, N. Harada, M. Iwakuma, K. Funaki, T. Matsushita

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Multifilamentary NbTi superconducting wires for a.c. use were developed by introducing ultrafine Nb island-type artificial pinning centres. The maximum Jc value obtained for wire with a filament diameter of 0.4 μm reached as high as 1.07 × 1010 A m-2 at 1 T and 4.44 × 109 A m-2 at 3 T, which are more than twice the Jc values for conventional wires for a.c. use. For these wires, the constants of the scaling rule for global pinning force, Fp α bγ(1-b)δ, became γ = 0.8 and δ = 1.6. This indicates that the pinning characteristics of the present wires were shifted to the oversaturation-type by the introduction of artificial pinning centres, while they are of the saturation-type for conventional a.c. wires. As a result, the global pinning force at low and medium magnetic fields can be explained fairly well by the direct summation model which is available only for strong pins. A helpful guideline in designing Jc values for a.c. wires is also discussed.

Original languageEnglish
Pages (from-to)315-322
Number of pages8
JournalCryogenics
Volume32
Issue number3
DOIs
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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