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Journal of Superconductivity

, Volume 10, Issue 2, pp 91–96 | Cite as

Nonlinear surface impedance in “low” and “high”T c superconductors

  • J. Halbritter
Article

Abstract

The degradation of the surface impedanceZ = R + iX with rf power is a principal limit for measurements and applications. Such nonlinearities occur for normal conducting cavities by heating or electron loading. But superconductors show a much richer spectrum of causes for nonlinearities. The nonlinearities in the surface resistance δR ∞ γ H n and surface reactance δR ∞ α H n can be classified by the ratior = δX/δ R. This ratio differs in value, temperature, or frequency dependence for the different mechanisms, allowing a unique identification of those mechanisms. This identification is a prerequisite for an improved rf cavity design and improvement of superconducting materials.

Key Words

Superconductors surface impedance highTc lowTc 

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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • J. Halbritter
    • 1
  1. 1.Forschungszentrum KarlsruheInstitut für Materialforschung IKarlsruheGermany

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