Some general results on electromagnetism are used to define fields and magnetisation in superconductors. Experimental techniques for measuring ac and dc magnetisation are described. Treatment of the results to give critical currents is discussed and details of flux profile techniques given. It is shown that if the displacement of the flux lines is proportional to the force and a function of frequency the London equation is obtained with a complex penetration depth. This is derived and the inductive transition plotted through the reversibility line.


External Field Flux Line Search Coil Critical State Model Reversibility Line 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • A. M. Campbell
    • 1
  1. 1.IRC in SuperconductivityCambridgeUK

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