Nature of the Josephson barrier in electron-beam-written YBa2Cu3O7−δ junctions
B. M. Hinaus, M. S. Rzchowski, B. A. Davidson, J. E. Nordman, K. Siangchaew, M. Libera
DOI 10.1103/PhysRevB.56.10828 · Physical Review B
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Abstract
We analyze the temperature (T) dependence of the normal-state resistance Rn and critical current Ic in field-emission-gun electron-beam-written YBa2Cu2O7−δ Josephson junctions from the electrode transition temperature (Tc) to 1.5 K. From a theoretical fit to Ic(T) and Rn(T) we find that the Josephson barrier exhibits properties of a small Fermi-surface area, dirty normal metal near its maximum metallic resistivity. Within conventional superconductor-normal-superconductor theory the barrier is 3.5 mean-free-paths long at Tc, with a normal-metal coherence length at Tc intermediate between the clean and dirty limits.
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 not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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