Correlation between critical behavior and magnetocaloric effect for La0.8-x•xNa0.2-x•xMnO3 (x=0 and 0.1) compounds

被引：14

作者：

Ameur, N. ^{[1
]}

Triki, M. ^{[1
]}

Dhahri, E. ^{[1
]}

Hlil, E. K. ^{[2
]}

机构：

[1] Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 1171, Sfax 3000, Tunisia

[2] Univ J Fourier, Inst Neel, CNRS, BP 166, F-38042 Grenoble, France

来源：

SOLID STATE COMMUNICATIONS | 2019年 / 292卷

关键词：

Critical properties; Magnetic materials; Second-order transition; Magnetocaloric effect; Arrott-Noakes plots; EQUATION-OF-STATE; DOUBLE-EXCHANGE; MAGNETORESISTANCE PROPERTIES; MAGNETIC-BEHAVIOR; PHASE-TRANSITION; NICKEL; SR;

D O I：

10.1016/j.ssc.2019.01.020

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The critical behavior of manganite perovskite type La0.8-x center dot xNa0.2x center dot xMnO3 (with x = 0 and 0.1) was studied based on the experimental magnetic measurements in the paramagnetic ferromagnetic transition region using different techniques such as the modified Arrott plot, the Kouvel-Fisher method and critical isothermal analysis. Experimental results revealed that the two samples show a second-order magnetic phase transition. The deduced critical exponents are close to a 3D Ising model for La0.8Na0.2MnO3 and a 3D tricritical mean field model for La0.7.0.1Na0.1.0.1MnO3. The reliability of these critical exponents was confirmed by the Widom scaling relation and the universal scaling hypothesis. Moreover, an excellent agreement was found between the spontaneous magnetization determined from the entropy change and from the extrapolation of the modified Arrott plots, confirming the universal behavior of the magnetocaloric effect in these systems.

引用

页码：40 / 49

页数：10

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