Impact of non-idealities on the conductance characteristics of superconductor-insulator-normal metal-insulator-superconductor tunnel junctions
Chaudhuri, S., & Maasilta, I. (2012). Impact of non-idealities on the conductance characteristics of superconductor-insulator-normal metal-insulator-superconductor tunnel junctions. In 26th International Conference on Low Temperature Physics (LT26) 10–17 August 2011, Beijing, China (pp. 42003). Institute of Physics. Journal of Physics: Conference Series, 400. https://doi.org/10.1088/1742-6596/400/4/042003
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We have investigated the effect of asymmetry in tunnelling resistance of individual
normal metal-insulator-superconductor (NIS) tunnel junctions that constitute a SINIS pair,
both experimentally and theoretically. Ours results clearly demonstrate that any finite
asymmetry in the tunnelling resistance gives rise to an excess current, as compared to its
symmetric counterpart, both below and around the gap edge. The signature of this excess
current is visible almost up to the critical temperature. We find that this apparent broadening
of the density of states is purely electrical in origin. Our calculations also show that any finite
resistance that is in series with the tunnelling resistance, such as the resistance of normal metal
island or the line resistance in case of two probe measurements, leads to a suppression of the
conductance maxima at the gap edge. This is a manifestation of the finite voltage drop across
the series resistor. Our experimental results validate our theoretical prediction.
...


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Except where otherwise noted, this item's license is described as © Published under licence by IOP Publishing Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence.
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