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Giant shot-like voltage noise in high current density Nb–AlOx–Nb superconducting tunnel junctions |
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| Authors: | B Savo P Romano A Nigro R Di Leo |
| Institution: | a Dipartimento di Fisica “E.R.Caianiello” and INFM, Università di Salerno, I-84081 Baronissi (SA), Italy b Facoltà di Scienze Matematiche, Fisiche e Naturali, Università del Sannio, I-82100 Benevento, Italy |
| Abstract: | The flat voltage noise component of current biased, high-transparency Nb/AlOx/Nb superconducting tunnel junctions has been investigated at frequencies up to 70 kHz. Several aspects of the analyzed phenomena suggest the presence of current noise effects induced by the discreteness of the charge carriers. At subgap voltages, where excess currents occur, a behavior coherent with a multiple Andreev reflection-assisted transport through the tunnel barrier has been found. However, the measured charge values exceed any theoretical prediction. |
| Keywords: | Noise Tunnel junctions Josephson effect |
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