Electrical and magnetic properties of the Kondo system (Ce_{1 - x} Y_x) Pt₂ Si₂ (0 ≤ x ≤ 1)

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) Pt₂ Si₂. 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.