Nb/MoSi2/Nb superconductor-normal metal-superconductor (SNS) stacked Josephson junctions have proven to be a good candidate for high-density series arrays for Josephson voltage standard applications. As the junction density increases, self-heating becomes an issue because the high 1 W/cm2 power density per junction generates significant power dissipation under typical operating conditions. In this letter, we analyze the heating effect of these sandwich-type SNS junctions using a model to quantitatively estimate and predict thermal transport properties of the stacked structures. We describe several strategies that improve the cooling power and demonstrate improved properties of stacked junction arrays with enhanced cooling capacity.
Citation: Applied Physics Letters
Pub Type: Journals