Violation of Kohler's rule at the charge density wave transition in 1T-TiSe2

Abstract

The Kohler scaling of magnetoresistance (MR) is examined across the charge-density-wave (CDW) transition of 1 T-TiSe2 microflakes. The normalized MR value vs ( B/ ρ0)2 showed linear dependence, where B is the magnetic field and ρ0 is the resistivity at zero magnetic field. However, all MR-( B/ ρ0)2 curves at various temperatures were not coincident with each other, demonstrating the violation of Kohler's rule. The Kohler slope, K =  dMR/ d[( B/ ρ0)2], and the MR value reached a minimum at the CDW transition temperature, TCDW. The nonmonotonous relationship between the Kohler slope and the Hall coefficient was observed, indicating a nonuniform electron scattering rate on the Fermi surface. The MR value satisfied the scaling laws of ∼| T −  TCDW|1.35 and ∼| T −  TCDW|0.62 below and above TCDW, respectively. Our results highlight magnetotransport properties of the 1 T-TiSe2 microflakes in the critical region of the CDW phase transition.