Critical behavior in Fe-doped manganites La0.67Ba0.22Sr0.11Mn1-xFexO3 (0 ≤ x ≤ 0.2)

被引：26
作者：
Ben Jemaa, F. [1 ]
Mahmood, S. H. [2 ]
Ellouze, M. [1 ]
Hlil, E. K. [3 ,4 ]
Halouani, F. [5 ]
机构：
[1] Sfax Univ, Fac Sci Sfax, Sfax 3000, Tunisia
[2] Univ Jordan, Amman, Jordan
[3] CNRS, Inst Neel, F-38042 Grenoble, France
[4] Univ Grenoble 1, F-38042 Grenoble, France
[5] Sfax Univ, Natl Sch Engineers, Sfax, Tunisia
来源：
JOURNAL OF MATERIALS SCIENCE | 2014年 / 49卷 / 20期
关键词：
CRITICAL EXPONENTS; DOUBLE-EXCHANGE; TRANSITION; NICKEL;
D O I：
10.1007/s10853-014-8390-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The critical properties of the manganese perovskite La0.67Ba0.22Sr0.11Mn1-x Fe (x) O-3 (0 <= x <= 0.2) around the paramagnetic (PM)-ferromagnetic (FM) phase transition were investigated using modified Arrott plots and Kouvel-Fisher method based on the data of static magnetic measurements recorded around the curie temperature T (C). Based on the evaluated critical exponents for the compounds with different x values (0.378 <= beta <= 0.411, 1.247 <= gamma <= 1.393, and 4.018 <= delta <= 4.73) we concluded that the PM-FM phase transition in the compound with x = 0 belongs to the three-dimensional Heisenberg universality. However, the substitution of Fe3+ for Mn3+ resulted in shifting the value of gamma toward the 3D-Ising model value and a slight increase in beta. This behavior was discussed and correlated with the random distribution of Fe3+ at the Mn3+ sites and the consequent suppression the double exchange interaction.
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收藏
页码：6883 / 6891
页数：9
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