Abstract
The properties of some RuO 2 thick film resistors, Philips type RC-01, have been studied between 15 mK and 4 K in magnetic fields up to 5 T. Resistors with room temperature resistance values between ≈ 1.0 and 4.7kΩ appear to have sufficient sensitivity, dR/RdT, for them to be used as secondary thermometers for temperatures < 4 K Thick film resistors have several advantages over carbon composition resistance thermometers which are used more generally, e.g. a better reproducibility, an easier method of mounting on metal surfaces and a lower heat capacity. However, in contrast to what has been published so far about thick film resistors from other manufactures, the type RC-01 shows a considerable magnetoresistance, which is of the same order as that found for carbon resistors.
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