Abstract
We report on a heterogeneous precipitation method to modify the surfaces of La 0.67Ca 0.33MnO 3 (LCMO) grains with CuO. It is shown that such a modification causes transport and magnetoresistance (MR) properties of the composites largely different from that observed in pure LCMO granular system. Especially, a significant enhancement in MR is observed near the insulator–metal transition temperature ( T IM). The maximum MR reaches as high as ∼88 and ∼90% at a low magnetic field of 0.3 T for the modified samples of LCMO/ xCuO with x = 4 and 15 mol%, respectively. Compared to pure LCMO, the CuO-modified samples have a substantial decrease in resistivity ( ρ) at the temperature regions apart T IM. Furthermore, for the x = 4% sample, a considerable thermal hysteresis is observed at the same temperature region where abnormal MR effect appears. On the basis of magnetization measurement and structural analysis, a possible interpretation for the experimental observations is presented.
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