Abstract
Thin films of the Chevrel phase superconductor AgMo 6S 8 have been prepared by simultaneous sputtering of silver and molybdenum onto sapphire substrates held at temperatures between 800°C and 1000°C using H 2S as a reactive gas. The best films have a superconducting critical temperature of 9.2 K and a transition width of 0.2 K. Depending on the deposition conditions the microstructure can be varied from films that are smooth on a sub-micron scale to films that have a grain size of fractions of a micron. The smooth films have a resistivity comparable to that measured for single crystals and a resistance ratio of twenty. The films with smaller grains resistivities which are anorder of magnitude higher and show very little temperature dependence. Critical field measurements of the films with high transition temperatures give a slope of the upper critical field of 1.7 T/K and a critical field extrapolated to zero temperature of 14 T.
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