实验研究了由Pechini方法制备的La1-xNaxMnOz系列多晶陶瓷样品的磁性质、热性质和输运性质,在77 K到居里温度范围得到了较高的低场磁电阻 ,并且,在电阻率-温度曲线观察到了两个峰:一个在居里温度附近,另外一个在远低于居里温度处.退火实验表明,氧含量的不均匀是造成电阻率-温度曲线上存在两个峰的主要原因.
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