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The thermal conductivity of polycrystalline samples of (Na,Ca)Co_2O_4 isfound to be unusually low, 20 mW/cmK at 280 K. On the assumption of theWiedemann-Franz law, the lattice thermal conductivity is estimated to be 18mW/cmK at 280 K, and it does not change appreciably with the substitution of Cafor Na. A quantitative analysis has revealed that the phonon mean free path iscomparable with the lattice parameters, where the point-defect scattering playsan important role. Electronically the same samples show a metallic conductiondown to 4.2 K, which strongly suggests that NaCo_2O_4 exhibits a glass-likepoor thermal conduction together with a metal-like good electrical conduction.The present study further suggests that a strongly correlated system withlayered structure can act as a material of a phonon glass and an electroncrystal.Comment: 5 pages 3 figures, to be published in Phys. Rev.

physical review. b, condensed matter

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Low thermal conductivity of the layered oxide(Na,Ca)Co2