Specific Heats of Dilute Cu-Co Alloys between 1.5° and 4.5°K

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Abstract
Specific heats of eight specimens of dilute copper-cobalt alloys were measured in the range of 1.5° to 4.5°K. Cobalt concentration of these samples lay between ¼ and 2½ weight percent. At all concentrations the specific heat is greater than that of pure copper, with the excess linear in temperature and quadratic in concentration for the lower concentrations at the higher temperatures. Near the lower end of this temperature range, samples of greater than 1¼% cobalt also exhibit an additional anomaly which appears to have a characteristic temperature proportional to cobalt concentration. A comparison to the specific heats of dilute Cu-Mn alloys shows that the magnetic interactions in Cu-Co and Cu-Mn must differ greatly in character.