Study of critical behavior of perovskite La0.8Ca0.2-xPbxFeO3 (x=0.0, 0.1 and 0.2) compounds
Study of critical behavior of perovskite La0.8Ca0.2-xPbxFeO3 (x=0.0, 0.1 and 0.2) compounds
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DOI：
10.1016/j.jallcom.2015.03.011
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发表时间：
2015-07-25
影响因子：
6.2
通讯作者：
Hlil, E. K.
中科院分区：
文献类型：
--
作者：
Benali, A.;Bejar, M.;Hlil, E. K.
本文分析了铁氧体钙钛矿型La_（0.8）Ca_（0.2-x）Pb_xFeO_3（x = 0.0，0.1和0.2）化合物在铁磁-顺磁（FM-PM）转变时的临界性质。实验结果表明，所有样品都表现出二级磁相变。利用修正的Arrott图、Kouvel-Fisher法和临界磁化等温线M（T-C，H）等方法，从磁性数据中估算出临界指数。所有样品的临界指数值与平均场理论的预测值非常吻合。这种行为的原因可能是该系统中自旋之间的长程相互作用。(C)2015爱思唯尔B. V.保留所有权利。
The critical properties of ferrite perovskite La0.8Ca0.2-xPbxFeO3 (x = 0.0, 0.1 and 0.2) compounds at the ferromagnetic-paramagnetic (FM-PM) transition have been analyzed. Experimental results revealed that all samples exhibit a second-order magnetic phase transition. The estimated critical exponents derived from the magnetic data using various techniques such as modified Arrott plot, Kouvel-Fisher method, and critical magnetization isotherms M (T-C, H). The critical exponent values for all samples are in a close agreement with those predicted for the mean-field theory. The reason for this behavior may be longrange interactions between spins in this system. (C) 2015 Elsevier B.V. All rights reserved.