AC Susceptibility and Inductive Critical Current Measurements in Polycrystalline YBa2Cu307

  • H. Küpfer
  • I. Apfelstedt
  • R. Flükiger
  • R. Meier-Hirmer
  • W. Schauer
  • T. Wolf
  • H. Wühl

Abstract

Polycrystalline sintered specimens of YBa2Cu307 with densities up to 95% and resistivities as low as 150 μΩcm at 100 K were investigated by means of ac susceptibility, resistivity and inductive critical current measurements. The tremendous increase of the transition width in an applied field observed by ac susceptibility measurements is attributed to the anisotropy of the upper critical field of the intragrain material and to the intergrain weak links which become superconducting at different fields and temperatures. The screening and loss behavior of the inter- and intragrain current system determines the ac susceptibility from which weak link properties are obtained by comparison of various specimens prepared following different procedures.

Keywords

Weak Link Critical Current Density Critical Field Flux Line Flux Profile 
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References

  1. 1.
    M.K. Wu, J.R. Ashburn, C.J. Torng, P.H. Hor, R.L. Meng, L. Gao, Z.J. Huang, Y.Q. Wang, C.W. Chu: Phys. Rev. Lett. 58, 908 (1987)CrossRefGoogle Scholar
  2. 2.
    D.C. Larbalestier, M. Daeumling, X. Cai, J. Seuntjens, J. McKinnell, D. Hampshire, P. Lee, C. Meingast, T. Willis, H. Muller, R.D. Ray, R. G. Dillenburg, E.E. Hellstrom, and R. Joynt, J. Appl. Phys. 62, 3308 (1987)CrossRefGoogle Scholar
  3. 3.
    S.B.Newcomb, B.A. Glowacki, A.M. Campbell, J.E. Evetts, W.M. Stobbs, to be published in British Ceramic Proceedings 40 (1988)Google Scholar
  4. 4.
    S. Jin, T. Tiefel, R. Sherwood, B. van Dover, presented at the Materials Research Society Fall Meeting at Boston, 30 November to 5 December 1987Google Scholar
  5. 5.
    R. Flükiger, T. Müller, T. Wolf, I. Apfelstedt, E. Seibt, H. Kupfer, W. Schauer, to be presented at the Int. Conf. on Materials and Mechanisms of Superconductivity at Interlaken, 29 February to 3 March 1988Google Scholar
  6. 6.
    T. Wolf, W. Goldacker, I. Apfelstedt, H. Kupfer, R. Flükiger, ibid. [5]Google Scholar
  7. 7.
    R.B. Goldfarb, A.F. Clark, A.I. Braginski, A.J. Panson, Cryogenics 27, 475 (1987)CrossRefGoogle Scholar
  8. 8.
    H. Kupfer, I. Apfelstedt, W. Schauer, R. Flükiger, R. Meier-Hirmer, H. Wühl, Z. Phys. B 69, 159 (1987)CrossRefGoogle Scholar
  9. 9.
    H. Mazaki, M. Takano, Y. Ikeda, Y. Bando, R. Kanno, Y. Takeda, O. Yamamoto, Jap. J. of Appl. Phys. 26. L1749 (1987)Google Scholar
  10. 10.
    R.W. Rollins, H. Kupfer, W. Gey, J. Appl. Phys. 45, 5392 (1974)CrossRefGoogle Scholar
  11. 11.
    A.M. Campbell, J. Phys. C2 1492 (1969)Google Scholar
  12. 12.
    J.R. Clem, V.G. Kogan, Proceedings LT 18,1161 Kyoto 1987Google Scholar
  13. 13.
    T.K. Worthington, W.J. Gallagher, T.R. Dinger, Phys. Rev. Lett. 59 1160 (1987)CrossRefGoogle Scholar
  14. 14.
    T. Matsushita, B. Ni, Y. Sudo, M. Iwakuma, K. Funaki, M. Takeo, K. Yamafuji, presented at the Japan - US Workshop on High-Field SC. Mater. Nov. 1987Google Scholar
  15. 15.
    H. Kupfer, I. Apfelstedt, R. Flükiger, R. Meier-Hirmer, W. Schauer, T. Wolf, H. Wühl, ibid. [5]Google Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • H. Küpfer
    • 1
  • I. Apfelstedt
    • 1
  • R. Flükiger
    • 1
  • R. Meier-Hirmer
    • 1
  • W. Schauer
    • 1
  • T. Wolf
    • 1
  • H. Wühl
    • 1
  1. 1.Kernforschungszentrum Karlsruhe, Institut für Technische PhysikUniversität KarlsruheKarlsruheGermany

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