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In electronic cooling with superconducting tunnel junctions, the coolingpower is counterbalanced by the interaction with phonons and by the heat flowfrom the overheated leads. We study aluminium-based coolers that are equippedwith a suspended normal metal and an efficient quasi-particle drain. Atintermediate temperatures, the phonon bath of the suspended normal metal iscooled. At lower temperatures, by adjusting the junction transparency, wecontrol the injection current, and thus the superconductor temperature. Thedevice shows a strong cooling from 150 mK down to about 30 mK, a factor of fivein temperature. We suggest that spatial non-uniformity in the superconductorgap limits the cooling toward lower temperatures.

Sub-50 mK electronic cooling with large-area superconducting tunnel junctions