Abstract
The resistivity of several (AlMgMn)-alloys with a magnesium mass content of 5%, and manganese contents of 0% up to 1%, has been measured in the temperature range of 1.5 to 4.2 K. It is shown that a Mn concentration of 0.078% produces a broad resistivity minimum at about 4.2 K; this means that the resistivity only varies by about 1.3 ppm between 1.5 and 4.2 K. It is further shown that the technical aluminium alloy AlMg 5 also has a similar small temperature coefficient of resistivity (TCR), in particular, the TCR is a few parts in 10 7/K for temperatures between 2 and 4.2 K. The fact that this alloy is commercially available and inexpensive, makes it very attractive as a low temperature resistance material for various applications.
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