Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-01-14
Physical Review B, Vol. 62, p. 4079 (2000)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 7 figures, extended version
Scientific paper
10.1103/PhysRevB.62.4079
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 may be interpreted as shot noise originating from large multiple charges.
Hoss T.
Huber Richard
Nussbaumer Thomas
Schönenberger Christian
Staufer Urs
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