In the search for effective thermoelectric materials the class of strongly correlated electron systems has become one the main research topics for low-temperature Peltier cooling applications.
In this paper we present results for a number of different compounds which exhibit strong correlations. The described heavy fermion metals have a particularly large thermopower S(T) below 30 K. The enhancement of the thermoelectric power is related to the large degeneracy of the ground-state f multiplet. The maximum in S(T) can be shifted by volume changes which cause a change of the hybridization. Some correlated semiconductors which have a huge thermoelectric power at low temperatures are also described. As an example, we consider FeSb2 which has a thermoelectric power exceeding −30,000μV/K at 10 K. Due to its semiconducting behavior, this material exhibits a record power factor PF = S 2σ, where σ is the electrical conductivity.
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Oeschler, N., Hartmann, S., Köhler, U., Deppe, M., Sun, P., Steglich, F. (2009). Thermoelectric Power of Correlated Compounds. In: Zlatić, V., Hewson, A.C. (eds) Properties and Applications of Thermoelectric Materials. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2892-1_5
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