Abstract
We have prepared compounds of 2H-NbSe2 and 2H-GaxNbSe2 (x=5% and 10%) at 700 °C. 2H-NbSe2 single crystal exhibits superconducting and charge density wave (CDW) transition at 7.4 K and 35 K, respectively, whereas in polycrystalline pellet of poor residual resistance ratio (RRR) value, the CDW is absent. In Ga-intercalated compounds, the rapid decrease of superconducting transition temperature was noticed. Here we report the occurrence of two-band model in which the temperature dependence of mean free path length ‘l(ε)’ is the main factor for overall behavior of resistivity and thermopower.
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