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Large thermoelectric power in NaCo2O4 single crystals

I. Terasaki, Y. Sasago, and K. Uchinokura
Phys. Rev. B 56, R12685(R) – Published 15 November 1997
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Abstract

We measured and analyzed the transport properties of single-crystal NaCo2O4, which is a metallic transition-metal oxide consisting of a two-dimensional triangle lattice of Co. Reflecting the crystal structure, the resistivity is highly anisotropic between in- and out-of-plane directions, and the in-plane resistivity is as low as 200 μΩ cm at 300 K. Most strikingly, the in-plane thermoelectric power of NaCo2O4 is about 100 μV/K at 300 K, which is nearly ten times larger than that of typical metals. The large thermoelectric power and the low resistivity suggest that NaCo2O4 is a potential thermoelectric material.

  • Received 18 July 1997

DOI:https://doi.org/10.1103/PhysRevB.56.R12685

©1997 American Physical Society

Authors & Affiliations

I. Terasaki

  • Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135, Japan

Y. Sasago and K. Uchinokura

  • Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan

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Vol. 56, Iss. 20 — 15 November 1997

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