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The thermoelectric power, $S(T)$, of the heavy fermions YbT$_{2}$Zn$_{20}$($T$ = Fe, Ru, Os, Ir, Rh, and Co) has been measured to characterize theirstrong electronic correlations. A large, negative, local minimum in $S(T)$ withapproximately -70 $\mu$V/K is found for all compounds. From the observed localminimum, the energy scales associated with both the Kondo temperature and thecrystalline electric field splitting are deduced and compared to previousspecific heat measurements. At low temperatures, $S(T)$ follows a lineartemperature dependence, $S(T)$ = $\alpha T$, with an enhanced value of $\alpha$which is characteristic for a heavy fermion state. In the zero temperaturelimit, the enhanced $\alpha$ value strongly correlates with the electronicspecific heat coefficient, $C(T)/T$, due to the large density of states at theFermi level.

Thermoelectric Power of the YbT$_{2}$Zn$_{20}$ (T = Fe, Ru, Os, Ir, Rh, and Co) Heavy Fermions