Abstract
Measurements of electrical resistivity ρ ( T ) , magnetoresistivity MR and magnetic susceptibility χ ( T ) are reported for the pseudo-ternary alloys ( Ce 1 - x Y x ) Pt 2 Si 2 . ρ ( T ) results reveal coherent Kondo scattering above 80% Ce concentration and a rapid evolution to single-ion Kondo scattering with an increase in Y concentration x. MR measurements on Ce alloys in the single-ion Kondo region are analyzed on the basis of calculations by Schlottmann for the Bethe-ansatz solution in the context of the Coqblin–Schrieffer model. The analysis yields values of the Kondo temperature T K and the effective moment of the Kondo ion μ K . χ ( T ) data above 120 K follow the Curie-Weiss relation for all the investigated concentrations and give effective moment values μ eff in close agreement with μ eff = 2.54 μ B expected for the Ce 3 + -ion.
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