Contact characteristics for YBCO bulk superconductors

Naoki Yamamoto, Tomokazu Sakai, Koichiro Sawa, Masaru Tomita, Masato Murakami

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


We have studied the contact characteristics of two resin-impregnated YBCO (a composite of YBa2Cu3Oy and Y 2BaCuO5) bulk superconductors in mechanical contact. A switching phenomenon could be observed at a threshold current or a transfer current value in the V-I curves of the YBCO contact. The transfer current exceeded the previous value of 13.5 A at 77 K in the contact when the sample surfaces were carefully polished. The present results suggest that a pair of YBCO blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems run in a persistent current mode.

Original languageEnglish
Pages (from-to)729-733
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberPART 1
Publication statusPublished - 2003 Oct
Externally publishedYes
EventProceedings of the 15th International Symposium on Superconduc - Yokohama, Japan
Duration: 2002 Nov 112002 Nov 13


  • Contact resistance
  • Persistent current switch
  • Transfer current
  • YBCO

ASJC Scopus subject areas

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


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