Comparison of Flux Bundle Size between Three-Dimensional Y-123 and Two-Dimensional Bi-2212 Superconductors

  • T. Matsushita
  • M. Kiuchi
  • H. Yamato
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)


Flux bundle size is estimated for a three-dimensional bulk Y-123 superconductor prepared by a quench and melt growth process and the result is compared with previously estimated result for a two-dimensional single crystal Bi-2212 superconductor. The longitudinal elastic correlation length along the c-axis, l 44, which was considered to correspond to the longitudinal flux bundle size, was directly measured using the Campbell method. It was shown that this length depends only on the flux pinning strength and is independent of the dimensionality of the superconductor. On the other hand, it was found that the transverse flux bundle size estimated from the observed relaxation rate and l 44 depends on the dimensionality and is likely to take a larger value for a superconductor with higher dimensionality. That is, the typical number of flux lines in the flux bundle is 1 for Bi-2212 and 5 for Y-123. This difference causes a large difference in the pinning potential. This speculation is quite different from the image drawn in the pancake vortex model.


Correlation Length Critical Current Density Flux Line Flux Creep Bundle Size 
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  1. 1.
    J. R. Clem, Two-dimensional vortices in a stack of thin superconducting films: A model for high-temperature superconducting multilayers, Phys. Rev. B 43: 7837 (1991).ADSCrossRefGoogle Scholar
  2. 2.
    N. Ihara and T. Matsushita, Effect of flux creep on irreversibility lines in superconductors, Physica C 257: 223 (1996).ADSCrossRefGoogle Scholar
  3. 3.
    M. Kiuchi, H. Yamato, and T. Matsushita, Longitudinal elastic correlation length of flux lines along the c-axis in superconducting Bi-2212 single crystal, Physica C 269: 242 (1996).ADSCrossRefGoogle Scholar
  4. 4.
    T. Matsushita, M. Kiuchi, H. Yamato, T. Hirano, and N. Koshizuka, Longitudinal elastic correlation length of flux lines along the c-axis in superconducting Bi-2212 single crystal in the field range near the peak effect, Physica C 277: 185 (1997).CrossRefGoogle Scholar
  5. 5.
    T. Matsushita, On the flux bundle size in weakly pinned superconductors, Physica C 217: 461 (1993).ADSCrossRefGoogle Scholar
  6. 6.
    T. Matsushita, M. Kiuchi, and Y. Nakayama, to be published in Proc. Int. Workshop on Critical Currents in Superconductors for Practical Application, Xi’an, 1997.Google Scholar
  7. 7.
    D. O. Welch, IEEE Trans. Magn. 27: 1133 (1991).ADSCrossRefGoogle Scholar
  8. 8.
    T. Matsushita, Effect of short coherence length along the c-axis on the irreversibility line in high-T. superconductors, Physica C 205: 289 (1993).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • T. Matsushita
    • 1
    • 2
  • M. Kiuchi
    • 1
  • H. Yamato
    • 1
  1. 1.Department of Computer Science and ElectronicsKyushu Institute of Technology680-4 Kawazu, Iizuka 820Japan
  2. 2.Department of Electrical and Electronic Systems EngineeringKyushu UniversityHakozaki, Higashi-ku, Fukuoka 812Japan

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