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)


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.


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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    H. Ihara, K. Tokiwa, H. Ozawa, M. Hirabayasi, H. Matsuhata, A. Negishi and Y.S. Song, Jpn. J. Appl. Phys 33:L503 (1994).CrossRefGoogle Scholar
  2. 2.
    M.A. Alario-Franco, C. Chaillout, J.J. Capponi, J.-L. Tholence and B. Souletie, Physica C 222:52 (1994).CrossRefGoogle Scholar
  3. 3.
    X.-J. Wu, S. Adachi, C.-Q. Jin, H. Yamauchi and S. Tanaka, Physica C 223:243 (1994).CrossRefGoogle Scholar
  4. 4.
    M. Hirabayashi, K. Tokiwa, H. Ozawa, Y. Noguchi, M. Tokumoto and H. Ihara, Physica C 219:6 (1994).CrossRefGoogle Scholar
  5. 5.
    H. Ihara, R. Sugise, M. Hirabayashi, N. Terada, M. Jo, K. Hayashi, A. Negishi, M. Tokumoto, Y. Kimura and T. Shimomura, Nature 344:510 (1988).CrossRefGoogle Scholar
  6. 6.
    D.H. Kim, K.E. Gray, R.T. Kampwirth, J.C. Smith, D.S. Richeson, T.J. Marks, J.H. Kang, J. Talvacchio and M. Eddy, Physica C 177:431 (1991).CrossRefGoogle Scholar
  7. 7.
    A. Iyo, K. Tokiwa, T. Kanehira, H. Ozawa, N. Kobayasi, N. Terada, M. Tokumoto, M. Hirabayasi and H. Ihara, Advances in Superconductivity VII (ISS94):825 (1994).Google Scholar
  8. 8.
    K. Tokiwa, T. Kanehira, K. Shiroki, H. Ozawa, Y.S. Song, A. Iyo, N. Terada, M. Tokumoto, M. Hirabayashi and H. Ihara, Advances in Superconductivity VII (ISS94):261 (1994).Google Scholar
  9. 9.
    Y. Tanaka, K. Tokiwa, A. Iyo and H. Ihara, Physica C 243:257 (1995).CrossRefGoogle Scholar
  10. 10.
    H. Matsuhata, H. Ihara, A. Iyo, K. Tokiwa and H. Ozawa, Physica C 242:326 (1995).CrossRefGoogle Scholar
  11. 11.
    H. Kawashima, Y. Matsui and E. Takayama-Muromachi, Physica C 224:69 (1994).CrossRefGoogle Scholar
  12. 12.
    T.R. Askew, R.B. Flippen, K.J. Leary and M.N. Kunchur, J. Mater. Res. 6:1135 (1991).CrossRefGoogle Scholar
  13. 13.
    U. Dai, G. Deutscher, C. Lacour, F. Laher-Lacour, P. Mocaer and M. Lagues, Appl. Phys. Lett. 56:1284 (1990).CrossRefGoogle Scholar
  14. 14.
    S. Senoussi, M. Oussena, G. Collin and I.A. Campbell, Phys. Rev. B 37:9792 (1988).CrossRefGoogle Scholar
  15. 15.
    R.S. Rui, D.N. Zheng, R. Janes, A.M. Campbell and P.P. Edwards, Solid State Commun. 76:1185 (1990).CrossRefGoogle Scholar
  16. 16.
    L.S. Vaidhyanathan and G. Rangarajan, Cryogenics 31:913 (1991).CrossRefGoogle Scholar
  17. 17.
    P. Manuel, C. Aguillon and S. Senoussi, Physica C 177:281 (1991).CrossRefGoogle Scholar
  18. 18.
    H. Kumakura, K. Togano, T. Kawashima and E. Takayama-Muromachi, Physica C 226:222 (1994).CrossRefGoogle Scholar
  19. 19.
    Y. Rui, H.L. Ji, X.N. Xu, H.M. Shao, M.J. Qin, X, Jin, X.X. Yao, X.S. Rong, B. Ying and Z.X. Zhao, Phys. Rev. B 51:9161 (1995).CrossRefGoogle Scholar
  20. 20.
    Y. Xu, M. Suenaga, Phys. Rev. B 43:5516 (1991).CrossRefGoogle Scholar
  21. 21.
    J. Vanacken, E. Osquiguil and Y. Bruynseraede, Physica C 183:163 (1991).CrossRefGoogle Scholar
  22. 22.
    A. Schilling, O. Jeandupeux, J.D. Guo and H.R. Ott, Physica C 216:6 (1993).CrossRefGoogle Scholar

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

Personalised recommendations