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Dependence of transport coefficients of the Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$series of alloys on temperature and cobalt concentration is explained by anasymmetric Anderson model which takes into account the exchange scattering ofconduction electrons on ytterbium ions and the splitting of 4$f$-states by thecrystalline electric field (CEF). The substitution of rhodium by cobalt isdescribed as an increase of chemical pressure which reduces the exchangecoupling and the CEF splitting. The scaling analysis and numerical NCA solutionof the model show that the effective degeneracy of the 4$f$-state at a giventemperature depends on the relative magnitude of the Kondo scale and the CEFsplitting. Thus, we find that dependence of the thermopower, $S(T)$, ontemperature and cobalt concentration can be understood as an interplay ofquantum fluctuations, driven by the Kondo effect, and thermal fluctuations,which favor a uniform occupation of the CEF states. The theoretical modelcaptures all the qualitative features of the experimental data and it explainsthe evolution of the shape of $S(T)$ with the increase of cobalt concentration.

Dependence of transport coefficients of Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$ intermetallics on temperature and cobalt concentration