B-site aluminum doping effect on magnetic, magnetocaloric and electro-transport properties of La0.7Sr0.3Mn1−xAlxO3
B-site aluminum doping effect on magnetic, magnetocaloric and electro-transport properties of La0.7Sr0.3Mn1−xAlxO3
复制标题
B位铝掺杂对La0.7Sr0.3Mn1−xAlxO3磁、磁热和电输运性能的影响
DOI：
10.1016/j.jallcom.2015.04.225
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发表时间：
2015
影响因子：
6.2
通讯作者：
In
中科院分区：
文献类型：
--
作者：
P. T. Phong;L. V. Bau;L. C. Hoan;D. H. Manh;N. Phuc;In
研究了组成范围 0 ⩽x⩽ 0.2 的 La0.7Sr0.3Mn1−xAlxO3 化合物的磁性、磁热和电传输性质。 Forx⩾ 0.15成分，表明Al浓度较高的化合物在居里温度以上表现出类格里菲斯相行为。观察到的异常顺磁行为归因于顺磁域中铁磁簇的存在。采用实验和理论方法来计算Al掺杂La0.7Sr0.3MnO3的磁热行为。最大熵变、半峰全宽、相对冷却功率、最大绝热温度等重要参数得到了定性解释。此外，为了了解 x⩾ 0.1 样品的电输运特性，我们应用了相共存输运模型，该模型取决于铁磁金属相和顺磁绝缘相的共存和竞争。该模型与整个研究温度范围内的实验结果完全一致。
Magnetic, magnetocaloric and electro-transport properties of La0.7Sr0.3Mn1−xAlxO3compounds in the composition range 0 ⩽x⩽ 0.2 were investigated. Forx⩾ 0.15 composition, it shows that the compounds with higher Al concentration show Griffiths phase-like behavior above the Curie temperature. The observed anomalous paramagnetic behavior is attributed to the existence of ferromagnetic clusters in the paramagnetic domain. Both the experimental and theoretical approaches were adopted to calculate the magnetocaloric behavior of Al-doped La0.7Sr0.3MnO3. The important parameters such as maximum entropy change, full width at half maximum, relative cooling power, and maximum adiabatic temperature have been explained qualitatively. Moreover, to understand the electrical transport properties ofx⩾ 0.1 samples, we applied phase-coexistence transport model, which depends on the coexistence and competition of ferromagnetic metallic phases and paramagnetic insulating phases. This model is in perfect agreement with experimental results over the whole range of temperatures studied.
影响因子：
3.2
作者：
E. Rozenberg
通讯作者：
E. Rozenberg