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Critical Current Density and Irreversibility Line of CuBa2Ca3Cu4Oy

  • A. Iyo
  • K. Tokiwa
  • N. Terada
  • M. Tokumoto
  • M. Hirabayashi
  • H. Ihara
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

The critical current density and irreversibility line of the single-phase polycrystalline sample of CuBa2Ca3Cu4Oy with Tc=l17 K have been estimated from measurements of magnetic hysteresis loops assuming Bean critical state model. Simple power law relations, Jc∝H-m, are observed in the magnetic field dependence of the intragrain Jc. Values of the intragrain Jc in a magnetic field of 1 T are about 106 and 104 A/cm2 at temperatures of 5 and 77 K, respectively. An exponential decay of the Jc with increasing temperature, Jc∝exp(-T/T0), is observed below 60 K. The characteristic temperature T0 of Cu-1234 is T0=16.1 K in a magnetic field of 1.0 T. The dependence of the Jc on temperature is relatively small among the oxide superconductors. Simple power law relations, Jc∝(l-T/Tc)n, are found in whole ranges of the temperature and magnetic field. The value of n is 5.24 for a magnetic field of 1.0 T The irreversibility fields at 70 and 77 K are estimated to be 9.5 and 3.7 T, respectively. The temperature dependence of the Hirr is fitted by Hirr=a(l-T/Tc)n with a=2130 and n=5.91.

Keywords

Magnetic Field Critical Current Density Magnetic Field Dependence Magnetic Hysteresis Loop Field Cool 
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 Science+Business Media New York 1996

Authors and Affiliations

  • A. Iyo
    • 1
  • K. Tokiwa
    • 2
  • N. Terada
    • 1
  • M. Tokumoto
    • 1
  • M. Hirabayashi
    • 1
  • H. Ihara
    • 1
  1. 1.Electrotechnical LaboratoryTsukuba, Ibaraki 305Japan
  2. 2.Science Univ. of TokyoShinjuku, Tokyo 162Japan

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