Transport Properties of Misfit-Layered Cobalt Oxide [Sr2O2-δ]0.53CoO2

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  • Transport Properties of Misfit-Layered Cobalt Oxide [Sr2O2−δ]0.53CoO2
  • Transport Properties of Misfit Layered Cobalt Oxide Sr2O2 デルタ 0 53CoO2
  • Transport Properties of Misfit-Layered Cobalt Oxide [Sr<sub>2</sub>O<sub>2-δ</sub>]<sub>0.53</sub>CoO<sub>2</sub>

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We report on the measurements and analyses of resistivity, Hall coefficient, and thermopower of the misfit-layered compound, [Sr2O2−δ]pCoO2, using single-crystalline samples obtained by a high-pressure technique. Using a polycrystalline sample, magnetic susceptibilities are measured to roughly characterize the electronic states of the cobalt ions. The misfit ratio, p, was determined to be 0.53 from transmission electron microscopic analyses. [Sr2O2−δ]0.53CoO2 shows metallic conduction down to 2 K and Curie–Weiss-like susceptibility as Na0.75CoO2 does. In addition, the thermopower at room temperature is the smallest among the known misfit-layered cobalt oxides, though the carrier concentration is almost the same as that of the misfit-layered compound, Ca3Co4O9, which has a much larger thermopower. We discuss the room-temperature thermopower in misfit-layered cobalt oxides from the viewpoint of incommensurability-induced anisotropy which changes the density of states near the Fermi level.

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