Low temperature thermopower and electrical transport in misfit Ca(3)Co(4)O(9) with elongated c-axis

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Low temperature thermopower and electrical transport in misfit Ca(3)Co(4)O(9) with elongated c-axis

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Title: Low temperature thermopower and electrical transport in misfit Ca(3)Co(4)O(9) with elongated c-axis
Author: BHATTACHARYA, S; RAYAPROL, S; SINGH, A; DOGRA, A; THINAHARAN, C; ASWA, DK; GUPTA, SK; YAKHMI, JV; KULKARNI, RN; YUSUF, SM; BHATIA, SN
Abstract: The temperature dependence of the electrical resistivity (rho) and thermopower (S) of misfit cobaltite Ca(3)Co(4)O(9) has been studied. The compound is a promising thermoelectric material, exhibiting very low rho (similar to 1.3 x 10(-4) Omega cm) and reasonably high S (similar to 56 mu V K(-1)) at room temperature, which is desirable for thermoelectric applications. At T < 80 K, S exhibits T(3/2) dependence, suggesting that electron-magnon scattering has a pronounced influence on S at low temperatures. Ca(3)Co(4)O(9) exhibits a temperature independent power factor in the temperature range 300-80 K. A comparison of the temperature dependence of the power factor of Ca(3)Co(4)O(9) with various materials projected or used as a thermoelectric cooler (e.g. single crystal of short c-axis Ca(3)Co(4)O(9), polycrystalline La(0.95)Sr(0.05)CoO(3), Bi(0.85) Sb(0.15), Bi(2)Te(3), Bi-SiO(2) composite) indicates that title compound Ca(3)Co(4)O(9) is a much superior candidate for thermoelectric applications.
URI: http://dx.doi.org/10.1088/0022-3727/41/8/085414
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9136
http://hdl.handle.net/10054/9136
Date: 2008


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