Current transport mechanism and control of the ν-value for ag/bi2212 wires and tapes

Satoshi Awaji, Takushi Inoue, Ken Ichiro Takahashi, Petre Badica, Gen Nishijima, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In order to study the mechanism of the small n-value for Bi2212, E - J characteristics were measured carefully for various kinds of Bi2212 tapes and round wires in high magnetic fields. Some of wires were heat-treated in a magnetic field of 5 T. We found that the ν-values of all the samples increase by the in-field heat-treatment at 5 T. In addition, we analyzed the E - J properties by the combination of the percolation model based on the local J c distribution and the two directional Jc distribution model. The improvement of the ν-value by the in-field heat treatment can be understood by the change of the aspect-ratio of the grains. Therefore, the aspect-ratio of the grains plays an important role in the current transport influencing not only Jc but also ν-value

Original languageEnglish
Article number5153165
Pages (from-to)3071-3075
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - 2009 Jun

Keywords

  • Ampersandnucolon-value
  • Bi2212 tape and wires
  • Critical current density
  • High magnetic field
  • In-field heat-treatment

ASJC Scopus subject areas

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

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