Macroscopic Quantum Interference Effect for High-T<sub>c</sub> YBaCuO and GdBaCuO Josephson Junctions
Akimitsu SugishitaInstitute of Materials Science, University of TsukubaManabu YanagisawaInstitute of Materials Science, University of TsukubaIenari IguchiInstitute of Materials Science, University of Tsukuba
1987en
ABI
Annotatsiya
DC SQUID operation utilizing all ceramic YBa 2 Cu 3 O 7-δ and GdBa 2 Cu 3 O 7-δ Josephson junctions is reported. It is confirmed that the macroscopic quantum interference effect is observable up to 90 K, almost the transition temperature of bulk cermaics. The periodic patterns of GdBa 2 Cu 3 O 7-δ SQUID are rather deformed; probably due to the presence of magnetic element Gd. The temperature dependence of Josephson critical current shows a nearly linear behavior down to low temperatures, in disagreement with Ambegaokar-Baratoff's calculation.
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