The effect of Fe substitution on magnetic and transport properties of LaMnO3
The effect of Fe substitution on magnetic and transport properties of LaMnO3
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DOI：
10.1016/j.jmmm.2004.09.118
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发表时间：
2005-03-01
影响因子：
2.7
通讯作者：
Kohara, T
中科院分区：
文献类型：
--
作者：
De, K;Ray, R;Kohara, T
用化学方法制备了单相LaMn1-xFexO_3(0小于或等于0.60)，研究了Fe替代对LaMnO_3磁性和输运性质的影响。预计这些样品的氧浓度略有非化学计量比。穆斯堡尔谱研究表明，这些化合物中的铁处于三价高自旋态。电阻率的绝对值在x=0.15时开始减小，然后随着x的进一步增大而迅速增大。所有化合物的温度依赖关系p(T)都是半导性的，可以用变程跃迁而不是绝热小极化子跃迁来解释。X小于或等于0.15的化合物表现出铁磁性特征，而x=0.30和大于或等于0.50的化合物分别表现出典型的团簇玻璃特征和复杂的玻璃特征。(C)2004爱思唯尔B.V.保留所有权利。
Single phases of LaMn1-xFexO3 (0less than or equal toxless than or equal to0.60) have been prepared by using chemical route to study the effect of Fe substitution on magnetic and transport properties of LaMnO3. Slightly non-stoichiometric oxygen concentration is expected for these samples. Mossbauer study indicates that Fe in these compounds is in the trivalent high-spin state. The absolute value of the resistivity decreases initially at x = 0.15 and then increases rapidly with the further increase of x. The temperature dependence, p(T), is semiconducting for all the Compounds and explained well by the variable range hopping rather than the adiabatic small polaron hopping. The compounds with x less than or equal to 0.15 show ferromagnetic characters while those for x = 0.30 and greater than or equal to0.50 exhibit typical cluster glass-like and complicated glassy features, respectively. (C) 2004 Elsevier B.V. All rights reserved.