Large thermoelectric power in NaCo2O4 single crystals
Large thermoelectric power in NaCo2O4 single crystals
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DOI：
10.1103/physrevb.56.r12685
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发表时间：
1997-11-15
影响因子：
3.7
通讯作者：
Uchinokura, K
中科院分区：
文献类型：
--
作者：
Terasaki, I;Sasago, Y;Uchinokura, K
我们测量和分析了单晶NaCo_2 O_4的输运性质，NaCo_2 O_4是一种过渡金属氧化物，由Co的二维三角晶格组成。反映晶体结构，电阻率在面内和面外方向之间具有高度各向异性，并且在300 K时面内电阻率低至200 μ Ω cm。最引人注目的是，NaCo 2 O 4的面内热电势在300 K时约为100 μ V/K，这比典型金属的热电势大近十倍。NaCo_2O_4具有很高的热电势和很低的电阻率，是一种很有潜力的热电材料。
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 mu Omega cm at 300 K. Most strikingly, the in-plane thermoelectric power of NaCo2O4 is about 100 mu V/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.