Critical Characteristics of Ultrafine Nb3Al Superconducting Wires Under Conduction Cooling Conditions

Seok Beom Kim, Hibiki Fukuda, Ryo Kimura, Ryota Inoue, Hiroshi Ueda, Akihiro Kikuchi, Yasuo Iijima

Research output: Contribution to journalArticlepeer-review


In recent years, an ultrafine Nb3Al wires with a diameter of less than 50 μm has been developed by a research group at the National Institute for Materials Science (NIMS) in Japan. Therefore, we are planning to use the developed high performance Nb3Al wires for superconducting applications operated by cryocooler. In order to design the superconducting applications cooled by cryocooler, it is necessary to measure the temperature and magnetic field dependence of the critical current of Nb3Al wires under conduction cooling conditions. Single and seven-stranded Nb3Al wires with different diameters (φ67 μm and φ81 μm) fabricated by the Jelly-rolled method were prepared. The barrier material of the two samples is the same Nb, but the core materials are Nb (φ67 μm) and Ta (φ81 μm), respectively. The Cu/nonCu ratio of the two samples is 1. In this study, the critical currents of sample wires were measured by a four-probe method with current sweep and constant current, and they were compared to define a reasonable critical current value under conduction cooling. Under conduction cooling, it was confirmed that the critical current measurement by the constant current method was more accurate than the current sweep method.

Original languageEnglish
Article number6001005
JournalIEEE Transactions on Applied Superconductivity
Issue number6
Publication statusPublished - Sep 1 2022


  • Conduction cooling
  • critical current characteristics
  • Ic measurement method
  • ultrafine Nb3Al wire

ASJC Scopus subject areas

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


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