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We present thermopower measurements on Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$. UponCo substitution the Kondo temperature is decreasing and the single largethermopower minimum observed for YbRh$_2$Si$_2$ splits into two minima.Simultaneously, the absolute thermopower values are strongly reduced due to aweaker exchange coupling between the $4f$ and the conduction electron stateswith increasing $x$. Pure YbCo$_2$Si$_2$ is considered a stable, trivalentsystem. Nevertheless, we still observe two minima in the thermopower indicativeof weak residual Kondo scattering. This is in line with results from photoemission spectroscopy revealing a tiny contribution from Yb$^{2+}$. The valueat the high-$T$ minimum in $S(T)$ is found to be proportional to the Sommerfeldcoefficient for the whole series. This unexpected finding is discussed inrelation to recent measurements of the valence and Fermi surface evolution withtemperature.

Thermopower evolution in Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$