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Magnetic field dependence of Griffith phase and critical behavior in La0.8Ca0.2MnO3 nanoparticles
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2019-04-01 , DOI: 10.1016/j.jmmm.2018.11.122
P.T. Phong , L.T.T. Ngan , L.V. Bau , N.X. Phuc , P.H. Nam , L.T.H. Phong , N.V. Dang , In-Ja Lee

Abstract In this work, the La0.8Ca0.2MnO3 nanoparticles of ∼30 nm were prepared by a sol-gel method, and their magnetic properties were investigated. The sample shows a paramagnetic-to-ferromagnetic phase transition at about 214 K. The Griffiths phase, which is identified by the downturn of the inverse susceptibility versus temperature plot from the Curie-Weiss law, is suppressed with the increase of the applied magnetic field strength such as 10 kOe. From the study of magnetic properties in terms of Arrot plots, the nature of magnetic transitions is found to be of second order. The critical behavior of La0.8Ca0.2MnO3 nanoparticles was studied around its Curie temperature. The estimated critical exponents were close to those expected for mean-field model. These critical exponents fulfill the Widom scaling relation, implying the reliability of our values.

中文翻译:

格里菲斯相的磁场依赖性和 La0.8Ca0.2MnO3 纳米粒子的临界行为

摘要 本工作采用溶胶-凝胶法制备了~30 nm 的La0.8Ca0.2MnO3 纳米粒子,并对其磁性能进行了研究。样品在大约 214 K 处显示了顺磁到铁磁的相变。 Griffiths 相,由居里-魏斯定律的反磁化率与温度图的下降确定,随着外加磁场的增加而受到抑制强度,如 10 kOe。根据阿罗图对磁特性的研究,发现磁跃迁的性质是二阶的。围绕其居里温度研究了 La0.8Ca0.2MnO3 纳米颗粒的临界行为。估计的临界指数接近平均场模型的预期指数。这些临界指数满足 Widom 标度关系,
更新日期:2019-04-01
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