Kondo effect in dilute Y-Ce alloys

Abstract

The influence of the hexagonal crystal field on the magnetic susceptibility and electrical resistivity of the Kondo system Y-Ce is studied in the framework of the $s-f$ exchange model. The second-order-perturbation-theory magnetic susceptibility is computed exactly in the whole range of temperatures and the results of the calculation are compared with the available experimental data. From the theoretical behavior of the magnetic susceptibility the general conclusion that no "Kondo sidebands" are present in the susceptibility-vs-$T$ curve is inferred. The third-order-perturbation-theory resistivity is computed exactly within the "usual" $f_k=\frac{1}{2}$ approximation and a Kondo temperature of 1.4 K is estimated.