The Specific Heat of Copper Alloys Containing Small Amounts of Iron

The specific heat of copper alloys containing small amounts of iron (0.3 to 3.5 at. % of iron) was measured under various heat treatment conditions at liquid helium temperatures. The excess specific heat of copper-iron alloys in solid solution was observed and it would be due to a magnetic origin. It is tried to explain the specific heat by the Marshall-Klein theory based on s-d interactions and the Ising model. The specific heat of copper alloys containing γ-iron precipitates involves a temperature independent contribution from the superparamagnetic character of γ-iron precipitates