Advertisement

The E-J Characteristic of YBaCuO Films Determined by Inductive Measurements

  • Wolfgang Schauer
  • Volker Windte
  • Meinrad Dickgießer
  • Daole Yin
  • Christian Neumann
  • Walter Maurer
  • Hans Reiner
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

An inductive method is used to determine the critical current density and the E-J characteristic for ring-, disk-, or plate-shaped YBaCuO films down to a sensitivity of 10–14 V/cm in magnetic fields up to 0.2 T and at varying temperature. A miniature Hall sensor monitors the field produced by screening currents, which flow as a response to an external field sweep. — Results are compared to existing theories describing the resistive state of high-Tc superconductors due to flux movement. Except for small intervalls of the measured E(J) relation, no satisfying agreement was found. This led us to extend the flux creep theory by introducing flux flow dissipation also in the creep regime, which results in a qualitative understanding of the observed E(J) behavior.

Keywords

Critical Current Density Sweep Rate Hall Sensor Vortex Loop Hall Voltage 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J. Evetts (ed.): “Concise Encyclopedia of Magnet and Superconducting Materials”, Pergamon Press, Oxford (1992)Google Scholar
  2. 2.
    M. Polak, V. Windte, W. Schauer, H. Reiner, A. Gurevich, and H. Wühl, Contactless measurement of voltage - current characteristics of high-Tc thin film superconductors, Physica C 174: 14 (1991)CrossRefGoogle Scholar
  3. 3.
    W. Schauer, V. Windte, M. Polak, H. Reiner, W. Maurer, A. Gurevich, and H. Wühl, Critical current density and E-J characteristics of YBaCuO films deduced from inductive measurements, in: “High T, Superconductor Thin Films”, L. Correra, ed., North-Holland, Amsterdam (1992)Google Scholar
  4. 4.
    M. Polak, V. Windte, W. Schauer, H. Reiner, A. Gurevich, W. Maurer, and H. Wühl, Critical current in disk shaped YBaCuO films determined by an inductive method, Supercond. Sci. Technol. 5: S403 (1992)Google Scholar
  5. 5.
    V. Windte, PhD Thesis, Karlsruhe (1992), published as KfK-Report 5189, Kernforschungszentrum Karlsruhe (1993)Google Scholar
  6. 6.
    D. Yin, W. Schauer, V. Windte, H. Kupfer, S. Zhang, and J. Chen, A new understanding of the resistive state and the V-I characteristic of High-T, superconductors, submitted to Z. f. Physik B.Google Scholar
  7. 7.
    S.J. Sackett, EFFI - A code for calculating the electromagnetic field, force, and inductance in coil systems of arbitrary geometry, Report UCRL-52402, Livermore/CA (1978)Google Scholar
  8. 8.
    J. Geerk, G. Linker, and O. Meyer, HTSC thin film growth by inverted cylindrical magnetron sputtering, J. of Superconductivty 5: 345 (1992)CrossRefGoogle Scholar
  9. 9.
    W. Schauer, X.X.Xi, V. Windte, O. Meyer, G. Linker, Q. Li, and J. Geerk, Growth quality and critical current density of sputtered YBaCuO thin films, Cryogenics 30: 586 (1990)CrossRefGoogle Scholar
  10. 10.
    W.K. Schomburg, M. Heidinger, G. Nöther, H. Reiner, V. Windte, W. Schauer, and K. Kadel, Patterning of high T, films for critical current measurements, Cryogenics 31: 366 (1991)CrossRefGoogle Scholar
  11. 11.
    A. Gurevich, H. Kupfer, B. Runtsch, R. Meier-Hirmer, D. Lee, and K. Salama, Transient regimes of flux creep in high-Ta superconductors, Phys. Rev. B 44: 12090 (1991)CrossRefGoogle Scholar
  12. 12.
    M.V. Feigelman, V.B. Geschkenbein, A.I. Larkin, and V.M. Vinokur, Theory of collective flux creep, Phys. Rev. Lett. 63: 2303 (1989)CrossRefGoogle Scholar
  13. 13.
    D.S. Fisher, M.P.A. Fisher, and D.A. Huse, Thermal fluctuations, quenched disorder, phase transitions, and transport in type-II superconductors, Phys. Rev. B. 43: 130 (1991)CrossRefGoogle Scholar
  14. 14.
    P.W. Anderson, and Y.B. Kim, Hard superconductivity: Theory of the motion of Abrikosov flux lines, Rev. Mod. Phys. 36:39 (1964); M.R. Beasley, R. Labusch, and W.W. Webb, Flux creep in type-II superconductors, Phys. Rev. 181: 682 (1969)Google Scholar
  15. 15.
    H. Kupfer, R. Kresse, R. Meier-Hirmer, K. Salama, D. Lee, and V. Selvamanickam, Investigation of collective creep in YBaCuO, Physica C 209. 243 ( 1993vCrossRefGoogle Scholar
  16. 16.
    C. Dekker, W. Eidelloth, and R.H. Koch, Measurement of the exponent p in the low temperature phase of YBa2Cu3O7-x films in a magnetic field: direct evidence for a vortex-glass phase, Phys. Rev. Lett. 68: 3347 (1992)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Wolfgang Schauer
    • 1
  • Volker Windte
    • 1
    • 2
  • Meinrad Dickgießer
    • 1
  • Daole Yin
    • 1
  • Christian Neumann
    • 1
  • Walter Maurer
    • 1
  • Hans Reiner
    • 1
  1. 1.Kernforschungszentrum Karlsruhe Institut für Technische PhysikKarlsruheGermany
  2. 2.Daimler-Benz AGFrankfurtGermany

Personalised recommendations