Contact characteristics for bulk superconductors

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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We have studied the contact characteristics of two resin-impregnated bulk superconductors in mechanical contact. In the previous work, it was confirmed that a switching phenomenon between high and low resistance range took place at a threshold current or a transfer current value in the V-I curves of YBCO contact. In this paper we found that the transfer current exceeded 30 A and the contact resistance were decreased to 40 μΩ at 77 K in the mechanical contact when the sample surfaces were carefully polished. Moreover we succeed in decreasing the contact resistance to 6 μΩ with depositing the metal on the contact surface. The present results suggest that a pair of superconducting blocks might be applicable to the mechanical persistent current switch for superconducting magnetic energy storage and other superconducting systems running in a persistent current mode.

Original languageEnglish
Pages (from-to)662-667
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue numberSPEC. ISS.
Publication statusPublished - 2004 Oct


  • Contact resistance
  • Metal deposition
  • 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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