Transport properties of a modified CDW insulator - Cox:TiSe2

Polycrystalline samples of Cox:TiSe2 have been prepared by solid state reaction and characterized by X-ray diffraction, SEM/EDX and XPS. Resistivity data indicate systematic changes upon the addition of cobalt with broad peaks due to Charge Density Wave (CDW) transitions. Clear features seen in thermoelectric power indicate the presence of CDW state in all the samples and are in line with the electrical transport data. Analysis based on a two band model for thermoelectric power could explain the results well. Addition of 1% Co in TiSe2 results in an enhancement of Weak Anti Localization (WAL) effect and supported by Hikami-Larkin-Nagaoka fit. Classical quadratic dependence along with an embedded weak localization (WL) feature at low fields is observed for 6% Co in TiSe2 that could be explained using a Khosla-Fischer fit due its close proximity for a magnetic transition.