Flux jumps in the magnetization of QMG processed Y1Ba2Cu3O7

K. Watanabe, S. Awaji, N. Kobayashi, S. Nimori, G. Kido, K. Kimura, M. Hashimoto

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The magnetization behaviour of quench-melt-growth (QMG) Y1Ba2Cu3O7 bulk materials has been measured at 77.3 and 4.2 K in high fields. The flux jump phenomena presented by means of sample extraction, vibrating sample and SQUID magnetometers were essentially due to the high Jc and the low specific heat at low temperature in the QMG-Y1Ba2Cu3O7 bulk. It was found that the irreversibility field measured magnetically is in practical agreement with that obtained resistively. The anisotropic Jc vs B properties at 4.2 K in the QMG-Y1Ba2Cu3O7 bulk were very different from those in Y1Ba2Cu3O7 films. It was considered that QMG-Y1Ba2Cu3O7 bulk materials include weak links due to imperfect c-axis alignment.

Original languageEnglish
Pages (from-to)959-963
Number of pages5
Issue number11
Publication statusPublished - 1992


  • critical current density
  • high T superconductors
  • magnetization

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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