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Thermoelectric Power in Ruthenates : Dominant Role of the Spin Degeneracy Term

Published online by Cambridge University Press:  26 February 2011

Yannick Klein
Affiliation:
yannick.klein@ensicaen.fr, Laboratoire Crismat, Caen, 14050, France
Sylvie Hébert
Affiliation:
sylvie.hebert@ensicaen.fr, Laboratoire Crismat, 6 Bd du Maréchal Juin, Caen, 14050, France
Antoine Maignan
Affiliation:
antoine.maignan@ensicaen.fr, Laboratoire Crismat, CNRS and ENSICAEN, 6 Bd du Maréchal Juin, Caen, 14050, France
Vincent Hardy
Affiliation:
vincent.hardy@ensicaen.fr, Laboratoire Crismat, Caen, 14050, France
Bernard Raveau
Affiliation:
bernard.raveau@ensicaen.fr, Laboratoire Crismat, Caen, 14050, France
Bogdan Dabrowski
Affiliation:
dabrowski@anl.gov, Northern Illinois University, DeKalb, IL, 60115, United States
Petr Tomes
Affiliation:
hejtman@fzu.cz, Institute of Physics of ASCR, Praha, 182 21, Czech Republic
Jiri Hejtmanek
Affiliation:
hejtman@fzu.cz, Institute of Physics of ASCR, Praha, 182 21, Czech Republic
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Abstract

The Seebeck coefficients of several ruthenates which structures derive from the perovskite, have been measured up to 800K. All the values above 300K are found to be in the range +25μV.K-1 to +35 μV.K-1, with a very weak dependence on both T absolute value and electrical resistivity. This demonstrates that S at high T depends mainly on the spin degeneracy term of the modified Heikes formula. The insensitivity of thermopower to the chemical doping confirms the applicability of the model. The present study also shows the good properties of ruthenates as thermoelectric p-type oxides for high T energy conversion.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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