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Substitution of Sb in FeSb$_2$ by less than 0.5% of Te induces a transitionfrom a correlated semiconductor to an unconventional metal with large effectivecharge carrier mass $m^*$. Spanning the entire range of the semiconductor-metalcrossover, we observed an almost constant enhancement of the measuredthermopower compared to that estimated by the classical theory of electrondiffusion. Using the latter for a quantitative description one has to employ anenhancement factor of 10-30. Our observations point to the importance ofelectron-electron correlations in the thermal transport of FeSb$_2$, andsuggest a route to design thermoelectric materials for cryogenic applications.

Unchanged thermopower enhancement at the semiconductor-metal transition in correlated FeSb$_{2-x}$Te$_x$