本文采用直流磁控溅射方法在(100)取向的LaAlO3基片上制备了系列多层膜: La0.67Ca0.33MnO3-δ/La0.67Sr0.33MnO3-δ/La0.67Ca0.33MnO3-δ (LC/LS/LC).并采用标准四探针方法对所制备样品的阻温关系进行了测量. 结果表明:在零场下,当上下两层厚度一定时,随着中间层(LS)厚度增加,多层膜的电阻率减小,金属-绝缘体转变温度(TM-I)向高温方向移动.在中间层(LS)厚度保持一定时,随着上下两层(LC)厚度增加,其电阻率和金属-绝缘体转变温度(TM-I)出现同样的变化规律.基于双交换理论,我们对以上结果给出了尝试性解释.
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