本文报道了用溶胶凝胶法并经过低温(900℃)后处理制备的具有非化学配比的La 2/3Ca 1/3Mn 1- x O 3 ( x =0～0.10)多晶样品的电输运和磁性质的实验研究.结果表明,随 x 的增加,样品呈现出明显增强的非本征磁电阻效应,同时其本征磁电阻效应减弱.实验还观察到样品的颗粒尺寸随 x 的增加而减小的现象.基于样品的结构特征,本文讨论了其独特输运性能的形成原因.
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