Abstract
Excess current peaks in the IV curves of SIS Josephson junctions have been observed by some groups [1-3]. These peaks have the shape of a resonance as a function of voltage. The resonances appear in the subgap regime of the junctions and the subgap current (leakage current) is concealed. The positions of the resonances do not change as a magnetic field is applied to the junctions, but their amplitude decreases when the supercurrent is suppressed. We have measured the subgap current of Al/AlO(x)/Al junctions and we show that these resonances are due to resonant modes in the chip design which are excited by the ac-Josephson effect. We present a chip design that decreases the amplitude of the resonances to a such degree that the subgap current is quantifiable.
| Original language | English |
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| Title of host publication | 25th International Conference on Low Temperature Physics (LT25) : Part 5: Superconductivity |
| Number of pages | 4 |
| Publication date | 2009 |
| Article number | 052063 |
| DOIs | |
| Publication status | Published - 2009 |
| Externally published | Yes |
| Event | 25th International Conference on Low Temperature Physics - Leiden Inst Phys, Kamerlingh Onnes Lab, Amsterdam, Netherlands Duration: 6 Aug 2008 → 13 Aug 2008 Conference number: 25 |
Conference
| Conference | 25th International Conference on Low Temperature Physics |
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| Number | 25 |
| Location | Leiden Inst Phys, Kamerlingh Onnes Lab |
| Country/Territory | Netherlands |
| City | Amsterdam |
| Period | 06/08/2008 → 13/08/2008 |
| Series | Journal of Physics: Conference Series |
|---|---|
| Volume | 150 |
| ISSN | 1742-6588 |