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한국자기학회 한국자기학회 학술연구발표회 논문개요집 AMC2008 Asian Magnetics Conference
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    초록·키워드

    Recently, cobalt oxides with a low dimensional structure such as Na₂CoO₂, Ca₃Co₄O₉, Ca₃Co₂O₆, etc. have attracted much attention due to the discovery of their large thermoelectric power of ~100 μV/K [1-3]. Interestingly, these cobaltates show several common features such as low dimensional structure, low electric conductivity, and the suspected mixed-valency of the cobalt ions. To understand the origin of the large thermoelectric power, roughly two approaches have been tried. One is the entropy approach that applies the Heikes formula to the spin-degeneracy of the cobalt ions in the Hubbard model for the strongly correlated electron systems [4], and the other is the traditional approach in which the thermoelectric power is calculated from the density of the states near the Fermi level under the relaxation time approximation. Many experiment ... 전체 초록 보기

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      UCI(KEPA) : I410-ECN-0101-2009-428-015844218