Contact resistance characteristics of high temperature superconducting bulk-II

Naoki Yamamoto, Takuya Imaizumi, Koichiro Sawa, Masaru Tomita, Masato Murakami

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


We have studied the contact characteristics of two resin-impregnated Y-Ba-Cu-O (a composite of YBa2Cu3Oy and Y2BaCuO5+10wt%Ag2O) bulk superconductors in mechanical contact. In the previous work, fundamental characteristics of mechanical contact between two YBCO bulks were studied. A switching phenomenon between high and low resistance range could be observed at a threshold current or a transfer current value in the V-I curves. In this paper we found that the transfer current exceeded 30A and the contact resistance decreased to 40 μΩ at 77K for the mechanical contact when the sample surfaces were carefully polished. Moreover we succeeded in decreasing the contact resistance to 6μΩ with depositing the metal on the contact surface. 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 that are run in a persistent current mode.

Original languageEnglish
Pages (from-to)234-239
Number of pages6
JournalElectrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
Publication statusPublished - 2003 Oct 21
Externally publishedYes
EventElectrical Contacts 20003 Proceedings of the 49th IEEE Holm Conference on Electrical Contacts - Washington, DC, United States
Duration: 2003 Sep 82003 Sep 10


  • Contact resistance
  • High-temperature superconductor
  • Persistent current switch
  • Transfer current
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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