Superconducting properties with high-field peak effect in ohmically-heated jelly-rolled Nb3Al wire

N. Harada, T. Hamajima, K. Nakagawa, G. Iwaki, O. Miura, K. Watanabe

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Jelly-rolled Nb3Al wires with a Nb matrix have been ohmically-heated at controlled maximum temperatures ranging from 1600 to 2000 °C in vacuum, in order to investigate the properties of pinning force densities at high magnetic fields. The samples were 1.34 mm diameter and 50 mm long. To obtain the stoichiometric composition of the A15 phase, each sample was quenched in vacuum after ohmic-heating. Critical currents have been measured up to 23 T by a four probe method. The critical temperature of the sample heated at 1940 °C was 18.3 K. In longitudinal cross-sections, the samples heated at maximum temperatures less than 1940 °C have layer structures consisting of Nb-rich regions and A15 phase regions. In the sample heated up to 1940 °C, which is the melting point of Nb3Al, these layers were not observed. This sample showed a remarkable peak effect in the critical current at high magnetic fields, over 20 T.

Original languageEnglish
Pages (from-to)1030-1033
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2000
Externally publishedYes
EventThe 16th International Conference on Magnet Tehnolopgy - Tallahassee, FL, USA
Duration: 1999 Sep 261999 Oct 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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