We have investigated the quasiparticle noise phenomena of Nb/Al/AlOx/Nb Josephson tunnel junctions fabricated with a window geometry. In the subgap region the I}< characteristics display excess currents at voltages corresponding to submultiples of the gap value. These structures can be ascribed to higher-order processes through the tunnel barrier. In the same voltage region, measurements performed by using a low-frequency technique are strongly indicative of shot noise levels higher than the expected ideal values.
Noise investigations in the subgap region of Nb-based tunnel junctions
Romano P;
2000-01-01
Abstract
We have investigated the quasiparticle noise phenomena of Nb/Al/AlOx/Nb Josephson tunnel junctions fabricated with a window geometry. In the subgap region the I}< characteristics display excess currents at voltages corresponding to submultiples of the gap value. These structures can be ascribed to higher-order processes through the tunnel barrier. In the same voltage region, measurements performed by using a low-frequency technique are strongly indicative of shot noise levels higher than the expected ideal values.File in questo prodotto:
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