Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-03-06
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages 3 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.61.12551
The thermal conductivity of polycrystalline samples of (Na,Ca)Co_2O_4 is found to be unusually low, 20 mW/cmK at 280 K. On the assumption of the Wiedemann-Franz law, the lattice thermal conductivity is estimated to be 18 mW/cmK at 280 K, and it does not change appreciably with the substitution of Ca for Na. A quantitative analysis has revealed that the phonon mean free path is comparable with the lattice parameters, where the point-defect scattering plays an important role. Electronically the same samples show a metallic conduction down to 4.2 K, which strongly suggests that NaCo_2O_4 exhibits a glass-like poor thermal conduction together with a metal-like good electrical conduction. The present study further suggests that a strongly correlated system with layered structure can act as a material of a phonon glass and an electron crystal.
Iguchi Yusuke
Itoh Toshiya
Takahata K.
Tanaka Daiki
Terasaki Ichiro
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