Josephson Effects in the Ba-Y-Cu-O Compounds
J. S. Tsai, Y. Kubo, J. Tabuchi
DOI 10.1103/PhysRevLett.58.1979 · Physical Review Letters
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Abstract
A point-contact Josephson junction between a bulk Ba-Y-Cu-O compound (Tc∼90 K) and a Nb needle has been made. The I−V characteristics under microwave radiation show Shapiro steps, confirming the Josephson nature of the formed contact. Spin-singlet superconductivity in the Ba-Y-Cu-O system is implied from the voltage of the steps. The temperature dependence of the critical currents suggests that the Josephson junction if formed between Nb and another material with much higher Tc. Internal Josephson structure within the bulk ceramics is not found in the Ba-Y-Cu-O system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Y,Ba)3Cu3O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| (Y,Ba)3Cu3O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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