Abstract
The effects of substituting rhodium by cobalt in the tetragonal antiferromagnetic compound CeRh2Si2 are studied by X-ray investigation and magnetic, electrical and specific heat measurements. In the Ce(Rh1-xCox)2Si2 solid solution, a transition from a magnetically ordered state to an intermediate valence state appears when x is nearly equal to 0.135. An increase of the linear coefficient of the specific heat gamma is observed at this transition. For x<or=0.125, the Neel temperature decreases rapidly when x increases.
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