Magneto-transport properties of nano-crystalline and poly-crystalline La0.6Pb0.4MnO3 thin films

We have investigated the magneto-transport properties of nano-crystalline (NC) and polycrystalline (PC) La0.6Pb0.4MnO3 (LPMO) thin films, which have different grain-boundary properties. Above metal–insulator transition temperature (TIM), the magnetic coupling between the grains governs the transport. In the low-temperature (T