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We reveal and explain a scaling behavior of the thermopower $S/T$ exhibitingby the archetypical heavy-fermion (HF) metal $\rm{YbRh_2Si_2}$ under theapplication of magnetic field $B$ at temperatures $T$. We show that the samescaling is demonstrated by such different HF compounds as $\beta$-${\rmYbAlB_4}$ and the strongly correlated layered cobalt oxide $\rm[BiBa_{0.66}K_{0.36}O_{2}]CoO_{2}$. Using $\rm{YbRh_2Si_2}$ as an example, wedemonstrate that the scaling behavior of $S/T$ is violated at theantiferromagnetic phase transition, while both the residual resistivity$\rho_0$ and the density of states $N$ experience jumps at the phasetransition, making the thermopower experience two jumps and change its sign.Our elucidation is based on flattening of the single-particle spectrum thatprofoundly affects $\rho_0$ and $N$. To depict the main features of the $S/T$behavior, we construct the $T-B$ schematic phase diagram of $\rm{YbRh_2Si_2}$.Our calculated $S/T$ for the HF compounds are in good agreement withexperimental facts and support our observations.

Scaling behavior of the thermopower of the archetypical heavy-fermion metal $\rm{YbRh_2Si_2}$