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首页> 外文期刊>RSC Advances >Critical phenomena and estimation of the spontaneous magnetization from a mean field analysis of the magnetic entropy change in La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3
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Critical phenomena and estimation of the spontaneous magnetization from a mean field analysis of the magnetic entropy change in La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3

机译：LA0.7CA0.1PB0.2MN0.2MN0.2MN0.95A0.025SN0.025O3磁熵变化的平均场分析自平均场分析的临界现象和估计自发磁化

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摘要

In the present work, we have studied the universal critical behavior in the perovskite-manganite compound La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3. Experimental results revealed that all samples exhibit a second-order magnetic phase transition. To study the critical behavior of the paramagnetic-ferromagnetic transition, various techniques such as modified Arrott plots, the Kouvel-Fisher method and critical isotherm analysis were used to determine the values of the Curie temperature T-C, as well as the critical exponents b (corresponding to the spontaneous magnetization), gamma (corresponding to the initial susceptibility) and d (corresponding to the critical magnetization isotherm). The critical exponent values for our sample are consistent with the prediction of the mean field model (beta = 0.46, gamma = 1.0, and delta = 2.94 at an average TC 1/4 302.12 K), indicating that the magnetic interactions are long-range. The reliability of the critical exponent values was confirmed by the Widom scaling relation (WSR) and the universal scaling hypothesis. Moreover, to estimate the spontaneous magnetization of La0.7Ca0.1Pb0.2Mn0.95Al0.025Sn0.025O3 perovskite, we used the magnetic entropy change (DSM), obtained from isothermal magnetization. The results obtained through this approach are compared to those obtained from classical analysis using Arrott curves. An excellent agreement is found between this approach and the one obtained from the extrapolation of the Arrott curves.
机译：在本作工作中，我们研究了钙钛矿 - 锰化合物La0.7ca0.1pb0.2mn0.95al0.025sn0.025o3中的普遍关键行为。实验结果表明，所有样品都表现出二阶磁相转变。为了研究副铁磁转变的临界行为，使用诸如改进的箭曲线，Kouvel-Fisher方法和关键等温线分析的各种技术来确定居里温度Tc的值，以及临界指数B（对应到自发磁化），γ（对应于初始敏感性）和D（对应于临界磁化等温线）。我们样本的临界指数值与平均TC 1/4 302.12 K的平均场模型（BETA = 0.46，GAMMA = 1.0和DELTA = 2.94）一致，表明磁相互作用是长距离的。临界指数值的可靠性由WIDOM缩放关系（WSR）和通用缩放假设确认。此外，为了估计La0.7ca0.1pb0.2mn0.95A10.025sn0.02503钙钛矿的自发磁化，我们使用从等温磁化获得的磁熵变化（DSM）。通过这种方法获得的结果与使用Arrott曲线的经典分析获得的结果进行比较。在这种方法之间发现了一个很好的一致性，并且从箭头曲线的外推获得的协议。

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  • 来源
    《RSC Advances》 |2018年第6期|共9页
  • 作者

    Dhahri Khadija; Dhahri N.; Dhahri J.; Taibi K.; Hlil E. K.;

  • 作者单位

    Univ Monastir Fac Sci Dept Phys Lab Mat Condensee &

    Nanosci Monastir 5019 Tunisia;

    Univ Monastir Fac Sci Dept Phys Lab Mat Condensee &

    Nanosci Monastir 5019 Tunisia;

    Univ Monastir Fac Sci Dept Phys Lab Mat Condensee &

    Nanosci Monastir 5019 Tunisia;

    USTHB FGMGP Dept SDM Bab Ezzouar 16311 Algeria;

    Univ J Fourier CNRS Inst Neel BP 166 F-38042 Gronoble France;

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  • 正文语种 eng
  • 中图分类 化学;
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