Abstract
In this article, thermopower study of the polycrystalline TiSe2 and its Fe intercalated TiSe2 has been analyzed in detail. TiSe2 is two dimensional material which formed in hexagonal crystal structure having space group p3̅m1(164). Temperature dependent resistivity shows a considerable shift in Charge Density Wave (CDW) transition temperature towards low temperature with vanishing CDW peak intensity. The thermopower data shows peak or dip indicating the existence of CDW hybridization and this is in line with the electrical transport data. A scaling has been done in thermopower data by normalization which can be understood in terms of variation of hybridization across the CDW transition. Further, the temperature dependent thermopower data is well fitted using Nordheim-Gorter rule by Two Band Model (TBM). The results of the fittings indicate a drastic decrease of activation energy upon Fe intercalation in TiSe2 in semiconducting counterpart. Moreover, Diffusion thermopower corresponding to the metallic part is systematic as far as carrier compensation is concerned.
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