Abstract

We have investigated the inplane and interplane charge dynamics in bilayered manganite crystals, La2–2xSr1+2xMn2O7 (0.3≤x≤0.5), which show the highly anisotropic charge-transport and magnetic properties, and the colossal magnetoresistance. In the layered magnetic system, the interplane as well as inplane charge dynamics is expected to critically depend on the interlayer magnetic coupling within and between the ferromagnetic- metallic (FM) MnO2 bilayers. The interlayer magnetic coupling shows the strong doping- level dependence, and is related to not only the magneto-transport properties but also the magneto-structural ones. We have also studied the low-temperature transport properties. The weak localization effect as evidenced by T 1/2-dependence of the inplane conductivity was observed for the ferromagnetic bilayered manganite, which indicates the layered magnetic system is a disordered three-dimensional metal in the ground state.

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