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History Dependence of Weakly Coupled Intergrain Currents in a Sintered Oxide Superconductor

  • T. Matsushita
  • B. Ni
  • K. Yamafuji
  • K. Watanabe
  • K. Noto
  • H. Morita
  • H. Fujimori
  • Y. Muto

Abstract

History dependence of the critical current density was measured for a sintered Y-Ba-Cu-O superconductor by resistive and ac inductive methods. The critical current density measured by the two methods took a smaller value in an increasing-field process than in a decreasing one. It was also shown that closed intragrain currents with much larger value were not influenced by the history. This reveals that the history dependence comes only from a weakly coupled intergrain currents. The effect of an excursion of the magnetic field, i.e., addition and removal of a perturbation in the field, on the intergrain current density was examined in detail. A self-field of the closed intragrain currents, which changes its direction depending on the history, is considered to be a cause of the history effect.

Keywords

History Effect Critical Current Density Oxide Superconductor History Dependence Bias Magnetic Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • T. Matsushita
    • 1
  • B. Ni
    • 1
  • K. Yamafuji
    • 1
  • K. Watanabe
    • 2
  • K. Noto
    • 2
  • H. Morita
    • 2
  • H. Fujimori
    • 2
  • Y. Muto
    • 2
  1. 1.Department of ElectronicsKyushu UniversityHigashi-ku, Fukuoka, 812Japan
  2. 2.Institute for Materials ResearchTohoku UniversitySendai, 980Japan

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