Extended Kohler's scaling and isosbestic point in the charge density wave state of 1T-VSe2

1T-VSe2 is a narrow-band transition metal chalcogenide that shows the charge density wave (CDW) state below TCDW = 110 K. Here, we have explored the relevance of Kohler's rule and the thermal transport properties of VSe2 across the CDW state in the presence of magnetic field. The magnetoresistance (MR) follows Kohler's rule above TCDW, while an extended Kohler's rule is employed below TCDW. Interestingly, we observed an anomaly in MR around T similar to 20 K, below which the MR value decreases with decreasing temperature. This anomaly is also reflected in the slope (kappa) of Kohler's plots and the relative change in the thermal excitation induced carrier density (nT). Despite a strong magnetic field of 14 Tesla, the TCDW remains largely unaffected in both electrical resistivity ( rho(T)) and Seebeck coefficient (S), although the application of magnetic field enhances the peak intensity of S at T similar to 60 K. The crossover of S curves measured at different magnetic fields at T similar to 20 K suggests the existence of a novel feature within the CDW state of VSe2 i.e. the presence of a locally exact isosbestic point.