Influence of a surface-depressed order parameter on the Josephson critical current in Bi2Sr2CaCu2O8+x nonhysteretic break junctions
R. S. Gonnelli, D. Puttero, G. A. Ummarino, V. A. Stepanov, F. Licci
DOI 10.1103/PhysRevB.51.12782 · Physical Review B
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Abstract
We observed nonhysteretic Josephson currents in the I-V characteristics of break junctions made at 4.2 K in single crystals of Bi2Sr2CaCu2O8+x. The I(V) curves, measured at different temperatures up to Tc, are correctly fitted by the resistively shunted junction model if the effect of the thermal fluctuations is included. The temperature dependence of the Josephson critical current Ic(T) deviates massively from the ideal BCS behavior but is fitted very well by a model that takes into account the intrinsic effect of a depressed order parameter at the surface of Bi2Sr2CaCu2O8+x.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 69 | Pressure not reported | unknown |
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