Superconducting aluminum heat switch and plated press-contacts for use at ultralow temperatures

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Abstract
We have measured the thermal conductivity of a 0.1-mm-thick Al foil in the normal and superconducting state down to 58 mK. At this temperature, our data give a ratio for the conductivities of kn/ks=1600 T−2. They show that Al is a better material for a heat switch than the usually used superconductors because of its large kn and large Debye temperature (reducing the lattice conductivity ks). In addition, we describe the design of a heat switch and an excellent performing demountable press-contact between Al and Cu, both gold plated, as joint to the switch.

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