A correct phenomenological model of the microwave surface impedance of a high-temperature superconducting (HTS) film with reduced number of fitting parameters is presented. Simple empirical expressions are proposed for London penetration depth at T=0 K and for the residual resistance parameter α versus the fitting parameter γ considered as a figure of merit of the HTS film at microwaves. The model is verified by a comparison of results of modeling and measurement data in a wide temperature range.
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Vendik et al. (1997) studied this question.
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