Specific Heats of Dilute Au-Co Alloys between 1.2° and 5°K

The specific heats of six specimens of dilute Au-Co alloys were measured between 1.2° and 5°K. Cobalt concentration of these samples lay between ½ and 3½ at.%. The specific heat is greater than that of pure gold at all alloy concentrations, with the excess at the higher temperatures being linear in temperature and proportional to the $\frac{3}{2}$ power of concentration for samples containing less than 2 at.% of cobalt. At the lower temperatures the specific heat excess is no longer linear in temperature, but diminishes less rapidly with decreasing temperature. The character of the specific heats of these Au-Co alloys is found to be very similar to the specific heats of dilute Cu-Co alloys.