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- W3136994025 abstract "We present two different techniques for achieving low resistance (<20 n $$Omega $$ ) contacts between copper and aluminium at cryogenic temperatures. The best method is based on gold plating of the surfaces in an e-beam evaporator immediately after Ar plasma etching in the same apparatus, yielding resistances as low as 3 n $$Omega $$ that are stable over time. The second approach involves inserting indium in the Al/Cu joint. For both methods, we believe key elements are surface polishing, total removal of the aluminum oxide surface layer, and temporary application of large (typ. 11 kN) compression forces. Such contacts are not demountable. We believe the values for gold plated contacts are the lowest ever reported for a Cu/Al joint of a few $$mathrm{cm}^{2}$$ . This technology could simplify the construction of thermal links for advanced cryogenics applications, in particular that of extremely low resistance heat switches for nuclear demagnetization refrigerators." @default.
- W3136994025 created "2021-03-29" @default.
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- W3136994025 date "2021-03-25" @default.
- W3136994025 modified "2023-10-09" @default.
- W3136994025 title "Very Low Resistance Al/Cu Joints for Use at Cryogenic Temperatures" @default.
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- W3136994025 doi "https://doi.org/10.1007/s10909-021-02575-x" @default.
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