Abstract
Specific heat and high field magnetization were measured for Ce(Fe 1- x Co x ) 2 , which shows a double magnetic transition in the concentration range of 0.04< x <0.3. The compounds with 0≤ x ≤0.3 show a specific heat anomaly due to the ferromagnetic to paramagnetic transition at T c . Magnetic entropy of CeFe 2 was evaluated as 2.5 J/K mol, which is much lower than that expected from a localized moment model. Besides anomaly at T c , another specific heat anomaly due to the antiferromagnetic (AF) to ferromagnetic (F) transition was observed for x =0.1 and 0.2. It is shown that the entropy change associated with the AF-F transition is mainly described by a difference in the electronic specific heat between the F and AF states. The AF-F transition of Ce(Fe 1- x Co x ) 2 is discussed from the thermodynamical point of view.
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