Abstract
MgB2 is atwo-gap superconductor and as a result may manifest unusual physical properties. The performanceof MgB2 films at microwave frequencies has so far been rather poor compared to that of Nballoys and this may result from intrinsic behaviour related to the double-gapstructure or extrinsic properties due to non-optimized thin films. Here we give adetailed report on the microwave magnetic field dependent surface impedance of anMgB2 thin film, using a parallel plate resonator, as a function of temperature. We discuss whetherthe framework used to analyse nonlinear behaviour for other superconductors, both low and highTc, but single-gap,has any validity for MgB2 and whether the films are limited by intrinsic or extrinsic behaviour. The key resultis the observation of junction-type switching effects at high microwave power.
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