From heavy fermion to mixed valence, a study of Ce(Pb1−xSnx)3

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Abstract
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.