Intrinsic Josephson effects in YBa2Cu3O7−δ single crystals with various oxygen deficiencies
H. B. Wang, J. Chen, K. Nakajima, T. Yamashita, P. H. Wu, T. Nishizaki, K. Shibata, N. Kobayashi
DOI 10.1103/PhysRevB.61.R14948 · Physical Review B
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Abstract
In our experiments, fully oxygenated YBa2Cu3O7−δ single crystals were annealed in flowing oxygen at various temperatures and quenched in liquid nitrogen to become oxygen deficient. These single crystals, with transition temperatures ranging from 35 K to 82 K, were then fabricated into mesalike devices along c axis with a−b plane dimensions down to 2 μm. We measured dc current-voltage (I−V) curves, and observed typical intrinsic Josephson effects such as hysteresis, voltage jumps, etc., in all oxygen deficient samples. However, the oxygen contents and a−b plane sizes of the samples greatly affected the appearances of the I−V characteristics, supplying important information on the intrinsic Josephson effects. Microwave responses were also explored for possible high-frequency applications.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure unresolved | onset |
| Bi2Sr2CaCu2O8-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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