Effect of magnetic exchange interaction in resistivity on 2H-Nb1−xVxSe2

Abstract

We have prepared polycrystalline compounds of NbSe2 and Nb1−xVxSe2, x = 0.05, 0.10 and studied temperature dependence of resistivity and magnetization for these compounds. The pure compound, 2H-NbSe2, shows the superconducting transition temperature at T S = 7.4 K as reported previously. This superconducting transition temperature decreases in daughter compounds, Nb0.95V0.05Se2 has T S at 3.5 K and Nb0.90V0.10Se2 (mixed phase of 2H and 1T) has T S at 3.0 K irrespective of their purity. A bump like anomaly around 100 K is observed in resistivity of 2H-polytype daughter compounds. The magnetization increases rapidly at very low temperature and well fitted by the Curie–Weiss law below 15 and 100 K for pure and daughter compounds respectively. We expect that the rise of magnetization at low temperature is due to the presence of localized magnetic moments of vanadium (V4+) accompanied with exchange interaction.