Abstract
This article reports the study of the magneto-transport properties of Lanthanum-based colossal magnetoresistive sample, , as a function of temperature. The samples were prepared by the solid state route by sintering at three different temperatures 1100°C, 1250°C and 1350°C; with a view to understand the influence of varying crystallite size on various physical properties. It has been observed that the change in the grain size with the sintering temperature alters the contributions of intrinsic and extrinsic resistances which results in some major effects on the magneto-transport behaviours. The occurrence of intrinsic and extrinsic transitions can be explained well by the consideration of the random network of resistances with two types of resistivities – one more resistive than the other; using time dependent and independent metallic volume fractions, respectively.
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