Influence of magnetic field on critical behavior near a first order transition in optimally doped manganites: The case of La1-xCaxMnO3 (0.2 ≤ x ≤ 0.4)

被引：90
|
作者：
Zhang, P. [1 ]
Lampen, P. [3 ]
Phan, T. L. [1 ]
Yu, S. C. [1 ]
Thanh, T. D. [2 ]
Dan, N. H. [2 ]
Lam, V. D. [2 ]
Srikanth, H. [3 ]
Phan, M. H. [3 ]
机构：
[1] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea
[2] Vietnam Acad Sci & Technol, Inst Mat Sci, Hanoi, Vietnam
[3] Univ S Florida, Dept Phys, Tampa, FL 33620 USA
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2013年 / 348卷
关键词：
Perovskite manganite; Magnetic transition; Critical behavior; MAGNETORESISTANCE; POINT;
D O I：
10.1016/j.jmmm.2013.08.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A detailed study of the properties of the ferromagnetic to paramagnetic transition in polycrystalline manganites La1-xCaxMnO3 (x=0.2, 0.3, 0.4) is presented. The first order transition in La0.7Ca0.3MnO3 is bordered by second order transitions in the neighboring La0.8Ca0.2MnO3 and La0.6Ca0.4MnO3 compositions. Analysis of the Landau-Lifshitz coefficients obtained from Arrott plots showed that while b(T) is uniformly negative in La0.7Ca0.3MnO3, it changes from positive to negative values in different magnetic field ranges for La0.8Ca0.2MnO3 and La0.6Ca0.4MnO3, indicating that the behavior cannot be described within a single model under the application of a strong field. The Kouvel-Fisher procedure performed on the samples with continuous transitions over different ranges of fitting field confirmed tricritical exponents in La0.6Ca0.4MnO3 but revealed that the critical exponents obtained for La0.8Ca0.2MnO3 depend strongly on the choice of field range, shifting from values consistent with short range (3D Heisenberg/3D Ising) interactions to those approaching the tricritical mean field model. This observation is attributed to the influence of magnetic field on the coexistence of energetically close double-exchange and super-exchange ferromagnetic interactions in La0.8Ca0.2MnO3. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：146 / 153
页数：8
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