Electrical Transport Measurements on Polycrystalline Superconducting Y-Ba-Cu-O Films

  • M. A. Stan
  • S. A. Alterovitz
  • D. Ignjatovic


The current-voltage, I–V, characteristics of polycrystalline Y-Ba-Cu-O films have been measured as a function of temperature. The I–V characteristics are interpreted using a model based upon an array of weak links with a statistical distribution of critical currents. In addition, we find evidence that the supercurrents flow in nearly independent filaments near Tc. Various criteria are discussed with respect to the definition of the transport critical current, Ic, in these films. A temperature dependence for Ic has also been deduced from the I–V data by appealing to an empirical scaling law. We propose that this temperature dependence, Ic α (1-T/Tc)2.2, is representative of the weaker links within the critical current distribution.


Critical Current Weak Link Resistive Transition Voltage Criterion OFHC Copper 
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  1. 1.
    T. T. M. Palstra, B. Batlogg, L. F. Schneemeyer, and J. V. Wazczak, Thermally Activated Dissipation in Bi-Sr-Ca-Cu-O, Phys. Rev. Lett., 60:1662 (1988).ADSCrossRefGoogle Scholar
  2. 2.
    J. W. Ekin, T. M. Larson, A. M. Hermann, Z. Z. Sheng, K. Togano, and H. Kumakura, Double-Step Behavior of Critical Current vs. Magnetic Field in Y-, Bi-, and Tl- Based Bulk High-Tc Superconductors, (preprint submitted to Physica C).Google Scholar
  3. 3.
    T. T. M. Palstra, B. Batlogg, R. B. van Dover, L. F. Schneemeyer, and J. V. Wazczak, Critical Currents and Thermally Activated Flux Motion in High-Temperature Superconductors, Appl. Phys. Lett., 54:763 (1989).ADSCrossRefGoogle Scholar
  4. 4.
    J. W. Ekin, Offset Criterion for Determining Superconductor Critical Current, Appl. Phys. Lett., 55:905 (1989).ADSCrossRefGoogle Scholar
  5. 5.
    S. B. Ogale, D. Dijkkamp, and T. Venkatesan, Current Transport in High-Tc Polycrystalline Films of Y-Ba-Cu-O, Phys. Rev. B, 36:7210 (1987).ADSCrossRefGoogle Scholar
  6. 6.
    J. W. C. deVries, M. A. M. Gijs, G. M. Stollman, T. S. Baller, and G. N. A. Van Veen, Critical Current as a Function of Temperature in Thin Y-Ba-Cu-O Films, J. Appl. Phys., 64:426 (1988).ADSCrossRefGoogle Scholar
  7. 7.
    J. F. Kwak, E. L. Venturini, R. J. Baughman, B. Morosin, and D. S. Ginley, High Critical Currents in Polycrystalline Tl-Ca-Ba-Cu-O Films, Cryogenics, 29:291 (1989).ADSCrossRefGoogle Scholar
  8. 8.
    H. E. Horng, J. C. Jao, H. C. Chen, H. C. Yang, H. H. Sung, and F. C. Chen, Critical Current in Polycrystalline Bi-Ca-Sr-Cu-O Films, Phys. Rev. B, 39:9624 (1989).CrossRefGoogle Scholar
  9. 9.
    P. England, T. Venkatesan, X. D. Wu, and A. Inam, Granular Superconductivity in R-Ba-Cu-O Thin Films, Phys. Rev. B, 38:7125 (1988).ADSCrossRefGoogle Scholar
  10. 10.
    C. Lebeau, J. Rosenblatt, A. Raboutou, and P. Peyral, Current-Voltage Hyperscaling in Arrays of Josephson Junctions, Europhys. Lett., 1:313 (1986).ADSCrossRefGoogle Scholar
  11. 11.
    J. E. Evetts, B. A. Glowacki, P. L. Sampson, M. G. Blamire, N. McN. Alford, and M. A. Harmer, Relation of the N-Value of the Resistive Transition to Microstructure and Inhomogeniety for Y-Ba-A2-Cu3–07 Wires, IEEE Trans. Magn., 25:2041 (1989).ADSCrossRefGoogle Scholar
  12. 12.
    C. J. G. Plummer and J. E. Evetts, Dependence of the Shape of the Resistive Transition on Composite Inhomogeneity in Multifilamentary Wires, IEEE Trans. Magn., 23:1179 (1987).ADSCrossRefGoogle Scholar
  13. 13.
    G. J. Valco, N. J. Rohrer, J. D. Warner, and K. B. Bhasin, Composition and Processing Effects in Sequentially Evaporated Y-Ba-Cu-0 Thin films, A.I.P. Proceedings, 182:147 (1989).ADSGoogle Scholar
  14. 14.
    S. S. Yom, T. S. Hahn, Y. H. Kim, H. Chu, and S. S. Choi, Exponential Temperature Dependence of the Critical Current in Y-Ba-Cu-0 Films, Appl. Phys. Lett., 54:2370 (1989).ADSCrossRefGoogle Scholar
  15. 15.
    R. G. Jones, E. H. Rhoderick, and A. C. Rose-Innes, Non-Linearity in the Voltage-Current Characteristic of a Type-2 Superconductor, Phys. Lett. A, 24:318 (1967).ADSCrossRefGoogle Scholar
  16. 16.
    J. Baixeras and G. Fournet, Pertes par Deplacement de Vortex dans un Supraconducteur de Type II Non Ideal, J. Phys. Chem. Sol., 28:1541 (1967).ADSCrossRefGoogle Scholar
  17. 17.
    J. Clarke, Supercurrents in Lead-Copper-Lead Sandwiches, Proc. Roy. Soc. A, 308:447 (1969).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. A. Stan
    • 1
  • S. A. Alterovitz
    • 1
  • D. Ignjatovic
    • 1
  1. 1.NASA — Lewis Research CenterClevelandUSA

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