Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-02-06
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.65.195106
Various physical quantities are measured and analysed for the Cu-substituted thermoelectric oxide NaCo_{2-x}Cu_xO_4. As was previously known, the substituted Cu enhances the thermoelectric power, while it does not increase the resistivity significantly. The susceptibility and the electron specific-heat are substantially decreased with increasing x, which implies that the substituted Cu decreases the effective-mass enhancement. Through a quantitative comparison with the heavy fermion compounds and the valence fluctuation systems, we have found that the Cu substitution effectively increases the coupling between the conduction electron and the magnetic fluctuation. The Cu substitution induces a phase transition at 22 K that is very similar to a spin-density-wave transition.
Iguchi Yusuke
Terasaki Ichiro
Tsukada Ichiro
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