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• W1506779658 abstract "Abstract A correlation between the thermoelectric power and the double exchange and superexchange magnetic interactions in the ferromagnetically ordered Cu x Co y Cr z Se 4 p-type spinel conductors (with low Co content y up to 0.11) and in the antiferromagnetically ordered n-type semiconductor (with Co content y  = 0.23) in the temperature range from 5 to 400 K is considered, respectively. The magnetic and thermopower investigations showed that a bandwidth of the 3d t 2g band due to Cr 3+ and Cr 4+ ions narrows with increasing cobalt content. For p-type conductors (with Co content y up to 0.11) all thermopower components are positive while for n-type semiconductor ( y  = 0.23) the phonon drag component is positive and the diffusion and impurity components are negative. In the latter case the linear dependence between thermopower ( S ) and the normalized electrical resistivity (ln  ρ / ρ 0 ) suggests a polaron conduction at high temperatures. The carrier diffusion dominates in single crystals with high cobalt content and the impurity component increases with increasing non-stoichiometry of a sample. For samples with low cobalt content y up to 0.11 the strong ferromagnetic coupling connected mainly with double-exchange mechanism makes easier the magnon excitations. Their intensities increase with increasing sample stoichiometry ( i.e. when x  +  y  +  z  → 3)." @default.
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• W1506779658 date "2009-01-01" @default.
• W1506779658 modified "2023-10-04" @default.
• W1506779658 title "Effect of double exchange on thermoelectric power of CuxCoyCrzSe4" @default.
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• W1506779658 doi "https://doi.org/10.1016/j.jallcom.2008.01.001" @default.
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