Improved cryoresistors with low temperature coefficients

A novel type of 10- and 12.9-k Omega cryoresistors operating in a liquid-helium bath with small temperature coefficient of resistivity have been built. Details for the fabrication of these improved cryoresistors are reported. Experimental evidence of their drift rates shows that they are on the order of a few parts in 10/sup 9/ per day. A reduction of the mean pressure of 98.7 kPa in the helium dewar to 86.1 kPa, corresponding to a temperature decrease from 4.19 to 4.07 K, did not change the resistance value by more than the experimental resolution of 4 parts in 10/sup 8/.<
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