Abstract
The surface resistivity R(H) and its magnetic field derivative dR/dH of a superconducting YBa2Cu3O7−δ ceramic pellet were measured with an ESR spectrometer. The behaviour of dR/dH as a function of the modulation amplitude would suggest a stepped microwave absorption of the pellet in the presence of a magnetic field. This conclusion is discussed in the context of the models for granular superconductors.
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