Extended Kohler's scaling, a low temperature anomaly and Isosbestic point in the charge density wave state of 1T-VSe_2

1T-VSe_2 is a narrow band transition metal chalcogenide that shows charge density wave (CDW) state below T_CDW = 110 K. Here, we have explored the relevance of Kohler's rule and the thermal transport properties of VSe_2 across the CDW state. The magnetoresistance (MR) follows Kohler's rule above T_CDW, while an extended Kohler's rule is employed below T_CDW. Interestingly, we observed an anomaly in MR at T = 20 K, below which MR value decreases on lowering temperature. This anomaly is also reflected in the slope (κ) of Kohler's plots and the relative change in the thermal excitation induced carrier density (n_T) also. The T_CDW remains largely unaffected in both electrical resistivity (ρ(T)) and longitudinal Seebeck coefficient (S_xx) even under a strong magnetic field of 14 Tesla. However, the application of magnetic field enhances the peak intensity of S_xx at T ∼ 60 K. Additionally, S_xx(T) curves measured at different fields exhibit a crossover at T = 20 K, which suggest the existence of unique feature in the CDW state of VSe_2 i.e. a locally exact isosbestic point.