Magnetocaloric effect and critical parameters near the ferromagnetic-paramagnetic phase transition in AMn0.825Ga0.175O3 compound

被引:1
作者
Omri, A. [1 ,2 ]
Dhahri, E. [1 ]
Hlil, E. K. [3 ,4 ]
机构
[1] Univ Sfax, Fac Sci Sfax, Lab Phys Appl, Sfax, Tunisia
[2] Univ Kairouan, Fac Sci & Tech Sidi Bouzid, Kairouan, Tunisia
[3] CNRS, Inst Neel, Grenoble, France
[4] Univ Grenoble 1, Grenoble, France
关键词
critical behavior; phase transition; perovskite; universal curve; CRITICAL EXPONENTS; CRITICAL-BEHAVIOR; SINGLE-CRYSTALS; MAGNETORESISTANCE; PEROVSKITE; EQUATION; POINT; STATE;
D O I
10.1080/01411594.2015.1041949
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The critical parameters provide important information concerning the interaction mechanisms near the paramagnetic (PM) to ferromagnetic (FM) transition. In this paper, we present a detailed study for the critical behavior of AMn(0.825)Ga(0.175)O(3) (A = La0.75Ca0.08Sr0.17) sample using the isothermal magnetization data. The critical exponents are estimated by various techniques such as the modified Arrott plot, Kouvel-Fisher plot and critical isotherm. Evaluations of critical exponents yield beta = 0.365 +/- 0.05, gamma = 1.218 +/- 0.02 and delta = 4.22 +/- 0.02 that are consistent with both predictions for the three-dimensional-Heisenberg model and those reported for materials with the FM transition. The field's dependence on the magnetic entropy change is also analyzed. It shows a power law dependence such as [GRAPHICS] . Finally, the second-order magnetic transition phase is proved by the construction of the universal curve's magnetic entropy change.
引用
收藏
页码:1098 / 1110
页数:13
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