CePb3 has been shown to be a heavy‐fermion antiferromagnetic system with a Neél temperature, TN=1.1 K, and CeSn3 is a mixed valent system with considerable  f‐spd hybridization. Studies of pseudobinary alloys from CePb3 to CeSn3 provide an excellent opportunity to examine systematically the evolution of physical properties as the  f‐spd hybridization increases and the heavy‐fermion state is suppressed. Measurements of the temperature dependence of the resistivity, magnetic susceptibility, and specific heat for the pseudobinary alloy Ce(Pb1−xSnx)3 are presented and discussed. Some features obtained from this study are that, upon substitution of Sn for Pb in CePb3, the electronic specific‐heat coefficient and low‐temperature magnetic susceptibility display a monotonic variation with increasing x and TN is rapidly suppressed.

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