Multiple Andreev reflection and giant excess noise in diffusive superconductor/normal-metal/superconductor junctions
T. Hoss, C. Strunk, T. Nussbaumer, R. Huber, U. Staufer, C. Schönenberger
DOI 10.1103/PhysRevB.62.4079 · Physical Review B
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Abstract
We have studied superconductor/normal-metal/superconductor (SNS) junctions consisting of short Au or Cu wires between Nb or Al banks. The Nb based junctions display inherent electron heating effects induced by the high thermal resistance of the NS boundaries. The Al based junctions show in addition subharmonic gap structures in the differential conductance dI/dV and a pronounced peak in the excess noise at very low voltages V. We suggest that the noise peak is caused by fluctuations of the supercurrent at the onset of Josephson coupling between the superconducting banks. At intermediate temperatures where the supercurrent is suppressed a noise contribution ∝1/V remains, which suggests the presence of a long-range proximity effect in the noise.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | onset |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.25 | Pressure not reported | onset |
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