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11. The E-J curve is calculated from the experimentally measured third-harmonic voltage vs. coil current curve. The electric field (E) at the film is calculated as (l/2πrc) (dφc /dt) where φc is the flux contain within a radius rc, the mean radius of the coil. At low distortion levels, the third harmonic voltage is proportional to φ;c. To plot E vs. J, the critical current density is estimated to be the sheet-current induced in a perfectly conducting film divided by the film thickness. The estimates for E and J are accurate in the limit where the ac field is effectively screened by currents induced in the film. In this experiment, the ac currents are low enough that this condition is satisfied.
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