Characterization of Electrical Transport in Lsmo with Enhanced Temperature of Metal-Insulator Transition

We have studied La_0.67Sr_0.33MnO₃ (LSMO) thin films with temperature of metal-insulator (T_MI) transition enhanced to above 400 K, and we estimated characteristic electrical transport mechanisms for these films. We have fitted the measured resistivity vs. temperature ρ(T) dependence in a wide temperature range 4-500 K using different mechanisms of the electrical transport in different parts of ρ(T). In addition to the narrow temperature range around T_MI very well agreement was found. We found out that the Debye's temperature was also increased (Θ_D ≈ 840 K) probably due to the change in crystallization of LSMO films.