Abstract
The magnetotransport properties of Ca0.85Gd0.15MnO3 have been studied analyzing the temperature and magnetic field dependent resistivity. High temperature (T>TCO: charge ordering temperature) conductivity has been found to be described by the non-adiabatic small polaron hopping (SPH) model. The manganite shows a parallel combination of SPH and variable range hopping (VRH) model below TCO. VRH model fits the corresponding low temperature data. The field depended magnetoresistance (MR) has been investigated with a phenomenological model considering the spin-polarized tunneling. The field dependent MR in scaled coordinate collapses into single curve demonstrating the temperature-independent behavior.
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