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The ceramic YBa2Cu4O8 (YBCO) composed of sub-micron-size grains is considered as a random Josephson-coupled network of 0 and π junctions and shows successive phase transitions. The first transition occurs inside each grain at Tc1 = 81 K, and the second transition occurs among the grains at Tc2 = 47 K. A magnetic glass behavior similar to those of spin-glasses is observed at temperatures below...
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