Ca_(1-x)Y_xMnO_3体系的电磁输运性能及团簇玻璃态行为

Studies on the resistivity,magnetism and cluster-glass behaviour in the Ca_(1-x)Y_xMnO_3 system

文章系统地研究了电子型掺杂Ca1-xYxMnO3(0<x≤0.3)体系的电阻、磁化强度与温度的关系。结果表明,当x≤0.10时,Ca1-xYxMnO3的电阻率随着钇掺杂量的增加而减小,同时反铁磁性(AFM)减小,铁磁性增强;当0.15≤x≤0.30时,Ca1-xYxMnO3电阻率随着钇掺杂量的增加而增加,反铁磁性逐渐增强,铁磁性减弱;另外,磁化强度测量观察到Ca1-xYxMnO3低温下的团簇玻璃态行为,其原因是随着钇离子掺杂量的升高,样品中的Mn3+离子增加并且Mn3+和Mn4+离子不均匀分布导致反铁磁和铁磁团簇在低温下随机共存。

The transport properties of resistivity and magnetism in theCa1-xYxMnO3（0〈x≤0.3） sys- tem are systematically investigated. It is found that the resistivity of Ca1-xYxMnO3（0≤x≤0. 10） is decreased with the increase of Y^3＋ doping content and at the same time the magnetization is increased. The resistivity of Ca1-xYxMnO3（0.15≤x≤0.30） is increased and the magnetization is decreased with the increase of Y^3＋ doping content. Furthermore ,cluster glass behaviour is observed at low temperature in the magnetic research ,and the reason is that the increasing of Mn^3＋ and the inhomogeneous distribution between Mn^4＋ and Mn^4＋ with the increasing of Y-doping level result in the random coexistence of ferrous magnetic and non-ferrous magnetic cluster glass at low temperature.