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Disorder effects on Kondo behavior in CePt 2+x

CePt 2 is an antiferromagnetic (AF) Kondo-lattice compound with T N ~1.7 K and T K ~4.6 K. The evolution of AF and Kondo interactions in CePt 2+x with x= 0, 0.5 and 1 is observed by analysis of the temperature-dependent specific heat. This analysis shows that ~56% of the Ce in CePt 2 is involved in Kondo interactions, with the rest involved in magnetic correlations. While 100% of the expected entropy (Rln2) is recovered by 15 K in CePt 2 , only 95% and 93% is recovered for x=0.5 and 1.0, respectively. Meanwhile a larger Kondo fraction (80-90%) and a smaller AF fraction (15-3%) is observed, while T K decreases from 4.6 K to 2.8 K as x increases from 0 to 1. This trend in T K is opposite that expected from the measured lattice contraction. We conjecture that lattice disorder induced by Pt alloying is responsible for these results.