Abstract
Epitaxial Tl 2Ba 2CaCu 2O x (Tl-2212) thin film grain boundary Josephson junctions have been fabricated on 24° SrTiO 3(STO) bicrystal substates by magnetron sputtering and post-annealing process. The junction characteristics have RSJ-like behavior with V c = I c R n of 95 μV at 95 K. The critical current of the junctions near T c (105K) has a temperature dependence similar to that of SNS type ones. The junctions have been used to form a dc-SQUID, which can operate at temperatures up to 99 K.
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