Cooling, conductance, and thermometric performance of nonideal normal metal-superconductor tunnel junction pairs
S. Chaudhuri, I. J. Maasilta
DOI 10.1103/PhysRevB.85.014519 · Physical Review B
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Abstract
We have investigated the effect of a difference in the tunneling resistances of the individual normal metal-insulator-superconductor (NIS) tunnel junctions in a double junction SINIS device, with particular emphasis on the impact on the conductance, cooling, and thermometric performance. By solving the electrical and thermal equations of the junctions in a self-consistent way, we find that asymmetry gives rise to many new features, such as appearance of an excess subgap current, improved cooling performance, exhibition of negative differential resistance, and improved temperature range of thermometric sensitivity. Experiments were also carried out to complement some of the numerical results. In addition, we studied theoretically and experimentally the effect of a finite series resistance, which also causes an excess current in the subgap region, and a suppression of the conductance maxima at the gap edge. Experimental results agree well with the theoretical predictions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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