Quantum effects in the superconducting ceramic Y1Ba2Cu3O7−<i>x</i>
B. I. VerkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovС. И. БондаренкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovA. LukashenkoScientific Production Combine “Monokrystallreaktiv,” Khar’kovA. A. ShabloScientific Production Combine “Monokrystallreaktiv,” Khar’kovI. V. SvechkarevScientific Production Combine “Monokrystallreaktiv,” Khar’kovV. P. SeminozhenkoScientific Production Combine “Monokrystallreaktiv,” Khar’kovG. E. ChurilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. A. KomashkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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Experimental results on quantum interference in a superconducting circuit with two tunnel contacts containing an insert of high-temperature Y1Ba2Cu3O7−x ceramic are reported. It is shown that a pressure point contact made from a point of Y–Ba–Cu–O ceramic and a planar surface of POS-61 solder possesses characteristics of a Josephson junction at 4.2 K. The conclusion is drawn that long-range order and pair correlations of charge carriers exist in these ceramics.
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