S. Hébert, Y. Klein, A. Maignan, J. Hejtmánek, B. Dabrowski
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Thermopower of ruthenium metallic oxides: Large influence of the spin degeneracy term
The thermoelectric properties of ruthenates have been investigated. All the materials studied here are metallic. Thermopower measurements up to high T show that, even if SrRuO3 is metallic up to 800 K, the Seebeck coefficient of SrRuO3 is constant from 160 K to 800 K, close to +33 muV/K. Different substitutions have been investigated, and the thermopower is almost not affected by the different substitutions, remaining constant from ~200-300 K up to 800K, close to +25-+35 muV/K. The same result is obtained in CaRuO3 and derived compounds. Surprisingly, the value of S is close to the theoretical value calculated from spin entropy term only
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