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首页> 外文期刊>RSC Advances >Magnetocaloric study, critical behavior and spontaneous magnetization estimation in La0.6Ca0.3Sr0.1MnO3 perovskite
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Magnetocaloric study, critical behavior and spontaneous magnetization estimation in La0.6Ca0.3Sr0.1MnO3 perovskite

机译：La0.6ca0.3sr0.1mno3 Perovskite的磁热理研究，临界行为和自发磁化估计

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摘要

A detailed study of structural, magnetic and magnetocaloric properties of the polycrystalline manganite La0.6Ca0.3Sr0.1MnO3 is presented. The Rietveld refinement of X-ray diffraction pattern reveals that our sample is indexed in the orthorhombic structure with Pbnm space group. Magnetic measurements display a second order paramagnetic (PM)/ferromagnetic (FM) phase transition at Curie temperature T-c = 304 K. The magnetic entropy change (Delta S-M) is calculated using two different methods: Maxwell relations and landau theory. An acceptable agreement between both data is noted, indicating the importance of magnetoelastic coupling and electron interaction in magnetocaloric effect (MCE) properties of La0.6Ca0.3Sr0.1MnO3. The maximum magnetic entropy change (-Delta S-M(max)) and the relative cooling power (RCP) are found to be respectively 5.26 J kg(-1) K-1 and 262.53 J kg(-1) for mu H-0 = 5 T, making of this material a promising candidate for magnetic refrigeration application. The magnetic entropy curves are found to follow the universal law, confirming the existence of a second order PM/FM phase transition at T, which is in excellent agreement with that already deduced from Banerjee criterion. The critical exponents are extracted from the field dependence of the magnetic entropy change. Their values are dose to the 3D-Ising class. Scaling Laws are obeyed, implying their reliability. The spontaneous magnetization values determined using the magnetic entropy change (Delta S-M vs. M-2) are in good agreement with those obtained from the classical extrapolation of Arrott curves (mu H-0/M vs. M-2). The magnetic entropy change can be effectively used in studying the critical behavior and the spontaneous magnetization in manganites system.
机译：提出了多晶锰LA0.6CA0.3SR0.1MNO3结构，磁性和磁热性能的详细研究。 X射线衍射图案的RIETVELD改进表明，我们的样品在具有PBNM空间组的正交结构中分析。磁性测量显示在居里温度T-C = 304k下的二阶顺磁性（PM）/铁磁（FM）相转移。使用两种不同的方法计算磁熵变（Delta S-M）：Maxwell关系和Landau理论。注意到两个数据之间的可接受的一致性，表明La0.6Ca0.3sr0.1mN3的磁热偶联和电子相互作用的重要性（MCE）性质的重要性。发现最大磁熵变（-delta sm（max））和相对冷却功率（RCP）分别为mu H-0 =的5.26J kg（-1）k-1和262.53J kg（-1） 5 T，制造该材料是磁制冷应用的有希望的候选者。发现磁熵曲线遵循普遍法，确认在T处的二阶PM / FM相转换的存在，这与已从Banerjee标准推导出的良好协议。从磁熵变化的场依赖性提取临界指数。它们的值为3D ising类是剂量。缩放法律遵守，暗示了他们的可靠性。使用磁熵变化（Delta S-M与M-2）确定的自发磁化值与从箭头曲线的经典外推获得的那些相一致（MU H-0 / M与M-2）吻合。磁熵变化可以有效地用于研究锰岩系统中的临界行为和自发磁化。

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  • 来源
    《RSC Advances》 |2018年第17期|共10页
  • 作者

    Jeddi M.; Gharsallah H.; Bejar M.; Bekri M.; Dhahri E.; Hlil E. K.;

  • 作者单位

    Univ Sfax Fac Sci Lab Phys Appl BP 1171 Sfax 3000 Tunisia;

    Univ Sfax Fac Sci Lab Phys Appl BP 1171 Sfax 3000 Tunisia;

    Univ Sfax Fac Sci Lab Phys Appl BP 1171 Sfax 3000 Tunisia;

    King Abdulaziz Univ Rabigh Coll Sci &

    Art Phys Dept POB 344 Rabigh 21911 Saudi Arabia;

    Univ Sfax Fac Sci Lab Phys Appl BP 1171 Sfax 3000 Tunisia;

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

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