Abstract

We discuss experimental results obtained using a tunable cylindrical coaxialcavity resonator constituted by an outer Cu cylinder and an inner bulkBi1.8Pb0.26Sr2Ca2Cu3O10 + x cylinder. We have used this device to investigate the microwave response of thesuperconducting wire, both in the linear and nonlinear regimes. In particular, by tuning thedifferent modes of the cavity to make them resonant at exactly harmonic frequencies, wehave detected the power emitted by the superconductor at the second- and third-harmonicfrequency of the driving field. The results obtained in the nonlinear regime, whether for themicrowave surface impedance or the harmonic emission, are discussed in the framework ofthe models reported in the literature for granular superconductors. The use of thiskind of device could be of great interest to investigate and characterize wires oflarge dimensions, to be used for implementing superconducting-based microwavedevices.

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