采用固相反应法制备了La0.7Ca0.3MnO3多晶样品并借助X射线衍射,零场下的电阻测量以及电子顺磁共振技术对样品的结构、电子输运和磁性质进行了研究.实验结果表明,在居里温度TC附近,电子顺磁共振(ESR)谱线出现异常,谱线表现出明显的不对称,共振场随着温度的降低向低温方向移动.我们发现在居里温度TC以下用两个洛仑兹峰对ESR谱线可以进行较好的拟合,从而有力地证明了在相转变温度TC附近存在铁磁与顺磁相的共存.
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