Properties of high-Tc Josephson junctions with Y0.7Ca0.3Ba2Cu3O7−δ barrier layers
L. Antognazza, B. H. Moeckly, T. H. Geballe, K. Char
DOI 10.1103/PhysRevB.52.4559 · Physical Review B
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Abstract
We report the use of Y0.7Ca0.3Ba2Cu3O7−δ as an epitaxial barrier between YBa2Cu3O7−δ (YBCO) electrodes in high-Tc superconductor-normal-superconductor edge junctions. Ca-doped YBCO is an overdoped version of YBCO, and it has an excellent lattice and thermal expansion match with YBCO. We show that these junctions exhibit clean interfaces with resistances smaller than 10−10 Ω cm2. We present the temperature dependence of the critical current density Jc and the junction resistance Rn for junctions with 200, 400, and 600 Å thick barriers of Y0.7Ca0.3Ba2Cu3O7−δ. As the temperature decreases, the resistance of the junction decreases faster than the resistance calculated from the resistivity of a Y0.7Ca0.3Ba2Cu3O7−δ film. We analyze our data by considering various possibilities for the microstructure in the barrier region. We discuss the ideal conventional proximity effect, diffusion between the barriers and the electrodes, and doping fluctuations inside the barrier. We find that combinations of these ideas explain the observed behavior with reasonable parameters.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure unresolved | zero_resistance |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
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