Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-08-03
Proc. of 17th International Conference on Thermoelectrics (1998) p.595
Physics
Condensed Matter
Strongly Correlated Electrons
LaTex 2.06 eith epsf style, 3 pages, 6 eps figures
Scientific paper
The resistivity and thermopower of polycrystalline (Na,Ca)Co_2O_4 were measured and analyzed. Both the quantities increase with x, suggesting that the carrier density is decreased by the substitutions of Ca^{2+} for Na^{+}. Considering that the temperature dependence of the resistivity show a characteristic change with x, the conduction mechanism is unlikely to come from a simple electron-phonon scattering. As a reference for NaCo_2O_4, single crystals of a two-dimensional Co oxide (Bi,Pb)_2M_3Co_2O_9 (M=Sr and Ba) were studied. The Pb substitution decreases the resistivity, leaving the thermopower nearly intact.
Itoh Toshiya
Kawata Tsutomu
Kitajima T.
Terasaki Ichiro
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