Development of a REBa2Cu3O7-δ multi-core superconductor with 'inner split' technology

Xinzhe Jin, Hidetoshi Oguro, Yugo Oshima, Tetsuro Matsuda, Hideaki Maeda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Recently, advanced research into fine filament technology for tape-shaped superconducting-coated conductors composed of REBa2Cu3O7-δ (RE123, RE: rare earth such as Gd or Y, 0 < δ < 1) has been carried out to improve performance in high magnetic fields by reducing the large diamagnetism of the RE123 superconducting layer. The major challenge for high-field NMR/MRI applications is to obtain high tensile stress tolerance above 500 MPa with a high critical current. In this study, a RE123 multi-core superconductor was fabricated via an 'inner split' method using a commercially available RE123 single-core coated conductor, where only the ceramics (RE123 and buffer layers) in wire are electrically separated to multi-filaments without superconducting current flow between the filaments. Experimental results show that wires having 2, 3, 4, or 5 cores have a high critical current (above 95% of the original) and maintain tensile stress tolerance above 650 MPa. The diamagnetism of the five-core wire is reduced ∼85% of the original at 7 T. Thus, the wire was optimized via inner split method for high-field use.

Original languageEnglish
Article number045006
JournalSuperconductor Science and Technology
Issue number4
Publication statusPublished - 2016 Mar 3


  • RE123
  • inner split
  • multi-core
  • superconducting wire

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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