Abstract
The resistive losses in a magnetic field H for granular superconductors can be attributed to three different processes: flux-flow, flux-creep and dephasing of Josephson junctions (JJ). The microwave absorption measurements are able to separate the three contributions to the losses, if the ranges of the magnetic field and the temperature are suitably selected. A calculation of the surface-resistance, based on the hypothesis of validity of the Bean model and which qualitatively explains the experimental results is given.
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