Role of magnetic polarons in magnetotransport of phase-separated electron systems: Monte–Carlo simulation

A kinetic Monte–Carlo simulation on magnetotransport behaviors of phase-separated magnetic conduction systems where the magnetic polaron aggregates are mixed with insulating phase is presented. The electron conductance is calculated by the spin-dependent electron tunneling among the magnetic polarons. The magnetotransport behavior as a function of volume fraction of magnetic polarons is simulated, reproducing the co-appearance of the insulating-metallic and ferromagnetic transitions. The metallic-insulating transition at low temperature is revealed. The picture of magnetic polaron aggregation as a mode magnetic insulator may be helpful to understand the magnetotransport behaviors in manganites.