Abstract
High frequency applications of superconductors in a dc magnetic field rely on the estimate of the characteristic crossover frequency νc between low and high losses. Customarily, high sensitivity resonant techniques, intrinsically operating at discrete frequencies, are used to estimate νc. We exploit here a method based on a dual frequency resonator. We show that single-frequency evaluations of νc lead to heavy underestimations of the superconductor surface resistance. We describe a combined analytical and experimental approach that gives more accurate estimates for νc, and additionally allows to test the underlying physical model.
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