用固相反应法制备了(1-x)La2/3Ca1/3MnO3/xCr2O3(x为摩尔分数)复合样品,实验研究了在外加0～3 T的磁场下,Cr2O3含量对该复合样品的电输运性质及磁电阻的影响.结果发现随着Cr2O3含量的增加,金属-绝缘体(M-I)转变温度Tp急剧降低,并且当Cr2O3含量x＞0.1时此转变消失.与此同时,电阻率随其含量增加而快速增大,特别的是在样品中观察到了较宽温度范围内显著增强了的磁电阻.这种结果的出现可能与Cr2O3有关的新相偏析在La2/3Ca1/3MnO3(LCMO)晶界和颗粒界面有关.
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