Abstract
A theoretical and experimental investigation is made of the surface impedance of dc current biased high-quality epitaxial YBa2Cu3O7−δ thin films using a coplanar resonator technique. The isotropic Ginzburg-Landau theory and a current-dependent coupled-grain model are used to model the resonant frequency shift and the change in unloaded quality factor Q0 due to the bias current. Good quantitative agreement is obtained between the two models and the measured resonant frequency shift. The change in Q0, determined from measurements, can be explained by the coupled-grain model. The Ginzburg-Landau theory predicts a change in Q0 which is several times less than given by measurements.
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