The high field magnetic dependence of critical current density at 4.2 k for ag-sheathed Bi2Sr2CaCu2Oy superconducting tape

Noritsugu Enomoto, Hiroyuki Kikuchi, Naoki Uno, Hiroaki Kumakura, Kazumasa Togano, Kazuo Watanabe

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61 Citations (Scopus)


Critical current density (Jc) at 4.2 K and its dependence on applied magnetic field was measured for Ag-sheathed Bi2Sr2CaCu2Oy superconducting tape. The specimen showed a strong grain alignment which could be attained by adjusting the conditions of heat treatment. The degree of crystal orientation (F) was evaluated to be up to 95% by XRD for this specimen. In the case of magnetic field applied in a direction parallel to the tape, the Jc initially decreased with the magnetic field from 1.2×105 A/cm2 at 1 T to 5×104 A/cm2 at 10T and then remained almost constant up to 23 T. As the F value decreased from 95%, Jc also decreased. The pinning force (Fp) of the 95%-F-value tape was estimated to be about 1×1010 N/m3 at 23 T. This value is larger than those of conventional low-Tc superconductors.

Original languageEnglish
Pages (from-to)L447-L449
JournalJapanese journal of applied physics
Issue number3
Publication statusPublished - 1990 Mar


  • Ag-sheathed superconducting tape
  • BiSrCaCuO
  • Critical current density
  • Grain alignment
  • Grain boundaries
  • High field magnetic dependence
  • SEM
  • X-ray diffraction

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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