Influence of Pr-doped manganite on critical behavior of La_{0.7鈭?span style='font-style: italic'>x}Pr_xBa_0.3MnO₃ (x=0.00, 0.1, 0.2)

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• 作者：J. Khelifi ; A. Tozri ; E. Dhahri ; E.K. Hlil
• 关键词：Manganite ; Quenched disorder ; Phase transition ; Critical behavior
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：January, 2014
• 年：2014
• 卷：349
• 期：Complete
• 页码：149-155
• 全文大小：2399 K

文摘

The La_{0.7鈭?em>xem>}Pr_<em>xem>Ba_0.3MnO₃ (<em>x=em>0.00, 0.1, 0.2) polycrystalline samples were prepared by solid-state reaction and their crystallographic structure was achieved by XRD patterns analysis. Magnetization measurements were performed versus temperature and applied magnetic field to investigate magnetic properties such as critical behavior near <em>Tem>_<em>cem>. Analysis in the vicinity of the ferromagnetic (FM)-paramagnetic phase-transition temperature evidences a second-order phase transition. Saturation magnetization and the initial susceptibility versus temperature are found to obey asymptotic relations. Using modified Arrott plot, Kouvel-Fisher method and critical isotherm analysis, the critical parameters (<em>Tem>_<em>Cem>, <em>尾em>, <em>纬em>, and <em>未em>) are determined in the two characteristic regions of low- and high-magnetic fields. The estimated critical exponents are close to both 3D-Heisenberg and mean field model values. The reliability of the critical exponent values was confirmed by the Widom scaling relation and the universal scaling hypothesis. The change in the universality class should be due to the increase of Pr content.