We have studied nonlinear, power-dependent, behavior of high temperature superconducting thin films, transmission lines, and resonators. Here we present measurements of a material-dependent parameter, the scaling current density J(0), which represents the influence of a current-dependent penetration depth on harmonic generation and intermodulation products. Four different measurement techniques were employed, and we show excellent agreement between them. The values of J0 are typically greater than 10(7) A/cm(2) at 76 K. Published by Elsevier Science B.V. [References: 7]
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