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JYX - Large-area SINIS tunnel junctions for cooling applications (full record)
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NIS tunnel junctions are small-scale structures consisting of a superconductor and a normal metal separated by a thin insulating barrier. They can be used in cooling applications at ultra low temperatures. A SINIS junction contains two NIS junctions in series. The cooling power of the device is proportional to the area of the junction and the energy gap of the superconductor.  In this work large-area Al/AlOx/Cu junctions were fabricated with standard lithographic techniques and ultra high vacuum evaporation. The areas of the junctions are 60 µm x 60 µm and 30 µm x 30 µm. Current-voltage characteristics of the devices were measured at millikelvin temperature range using 3He-4He-dilution refrigerator. The obtained IV and dI/dV data deviates from ideal BCS behavior, but still shows some typical tunnel junction characteristics. In addition to aluminum, Nb/Al/AlOx/Cu junctions with niobium as the superconducting electrode were also fabricated. Nb is the element with the highest energy gap, making it theoretically ideal material for SINIS cooler fabrication.
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Large-area SINIS tunnel junctions for cooling applications
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Julin, Juhani; Maasilta, Ilari (Institute of Physics Publishing Ltd.; Institute of Physics, 2016)
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