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VOLUME 51 (1990) | ISSUE 3 | PAGE 138
Frequency dependence of magnetic-field response of granular superconductors
Experiments of granular Y 1Ba2Cu307 superconducting films at Г — 77 К have revealed that the magnetic-field dependence of the microwave absorption (9 GHz) Pn and that of the rf screening (100 kHz) Ρω can be brought into coincidence by doubling the magnetic-field (H) scale for the microwave response. The frequency of the magnetic-field oscillations in dPiX /dH'is twice that of the oscillations in dP(0 /dH. A model is proposed to explain this doubling and the magnetic-field dependence.