Abstract
Macroscopic quantum phenomena and superconducting glass state have been observed simultaneously in a random system of linked Josephson junctions in lumps of suitable high temperature superconducting ceramics Y-Ba-Cu-O. This multiply connected Josephson medium was used for radio-frequency SQUID operation at temperatures up to 90 K. The effect of nonergodic glass state on SQUID behaviour readily was observed. The presence of a wide range of relaxation times in glass state leads to an appreciable noise of 1/f type in the SQUID output signal at f ≲ 103 Hz.
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