AIP Digital Archive
Cermet thin-film resistors consisting of roughly 50-A(ring) Pt or Mo particles in Al2O3 at compositions just below the percolation transition provide a number of useful features for thermometry. These include: continuous sensitivity from at least 50 mK to 300 K, adjustable temperature dependence, low heat capacity, small size, excellent stability, and a saturable magnetoresistance. The fabrication, microstructure, and temperature dependence of the resistance and magnetoresistance of these materials are described. We find poor agreement with existing theories of conduction in granular materials.
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