Abstract
We report experimental results on the second-order response of superconductors in the critical state exposed to intense pulsed microwave (mw) fields. The second-harmonic power radiated by the samples is investigated during the time interval in which the mw pulse endures, for mw pulses ≈1 ms long. The second-harmonic signal exhibits a time decay whose features depend on the investigated sample, the input power level, and the way in which the value of the static magnetic field has been reached. The transient is ascribed to processes of magnetic flux redistribution, which come into play when fluxons in the critical state are driven by electromagnetic (em) fields of high frequency.
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