Enhanced thermoelectric power and electronic correlations in RuSe2

We report the electronic structure, electric and thermal transport properties of Ru1−xIrxSe2 (x ≤ 0.2). RuSe2 is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe2 exceeds −200 μV/K around 730 K. Ir substitution results in the suppression of the resistivi...

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Bibliographic Details
Main Authors: Kefeng Wang, Aifeng Wang, A. Tomic, Limin Wang, A. M. Milinda Abeykoon, E. Dooryhee, S. J. L. Billinge, C. Petrovic
Format: Article
Language:English
Published: AIP Publishing LLC 2015-04-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.4913919
Description
Summary:We report the electronic structure, electric and thermal transport properties of Ru1−xIrxSe2 (x ≤ 0.2). RuSe2 is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe2 exceeds −200 μV/K around 730 K. Ir substitution results in the suppression of the resistivity and the Seebeck coefficient, suggesting the removal of the peaks in density of states near the Fermi level. Ru0.8Ir0.2Se2 shows a semiconductor-metal crossover at about 30 K. The magnetic field restores the semiconducting behavior. Our results indicate the importance of the electronic correlations in enhanced thermoelectricity of RuSb2.
ISSN:2166-532X