Abstract
We present a large set of experimental results of the microwave magnetoabsorption at various temperatures for granular samples of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O. In the frame in which the absorption, as a function of the magnetic field, is due to the decoupling of the Josephson junctions (present in large number in these granular superconductors), we show that the array of Josephson junctions is driven in a frozen state by the magnetic field at low temperature. The transition to the frozen state occurs in a narrow range of temperature (15\char21{}20 K for Y-Ba-Cu-O and 20\char21{}30 K for Bi-Sr-Ca-Cu-O). The paper clarifies the role of the magnetic and thermal history, and adds experimental evidence to the superconducting-glass model for high-${\mathit{T}}_{\mathit{c}}$ granular superconductors.
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