Electrical, magnetic and thermal properties of Pr0.6-xBixSr0.4MnO3 manganites
Electrical, magnetic and thermal properties of Pr0.6-xBixSr0.4MnO3 manganites
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DOI：
10.1016/j.jallcom.2013.11.033
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发表时间：
2014-03-05
影响因子：
6.2
通讯作者：
Rao, Ashok
中科院分区：
文献类型：
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作者：
Daivajna, Mamatha D.;Kumar, Neeraj;Rao, Ashok
本文报道了Bi掺杂Pr0.6Sr0.4MnO3（PSMO）化合物的电学、磁学和热学性质。这些测量结果表明，转变温度降低与Bi含量。对电阻率和热电势测量数据的分析表明，所有样品在高温顺磁相都符合小极化子跳跃模型。在本工作中研究的样品的热导率，卡帕（T）被发现是低的，这基本上是由于在样品中的Jahn-Teller（JL）失真。观察到kappa（T）随着Bi掺杂浓度的增加而减小，这可能是由于形成了作为散射中心的JT极化子。从比热测量，我们观察到的熵变值的减少与铋含量的增加，这表明，磁不均匀性增加与Bi取代。(C)2013年爱思唯尔B。V.保留所有权利。
In the present communication, we report the electrical, magnetic and thermal properties of Bi-doped Pr0.6Sr0.4MnO3 (PSMO) compounds. These measurements show that the transition temperature decreases with Bi-content. Analyses on the measured electrical resistivity and thermoelectric power data indicate that the small polaron hopping model is operative in the high temperature paramagnetic phase for all samples. The thermal conductivity, kappa(T) for samples studied in the present work is found to be low which is essentially due to Jahn-Teller (JL) distortion in the samples. It is observed that kappa(T) is seen to decrease with increase in doping concentration of Bi which is possibly due to the formation of JT polarons which act as scattering centers. From specific heat measurements, we observe reduction in values of entropy change with increase in bismuth content which suggests that the magnetic inhomogeneity increases with Bi substitution. (C) 2013 Elsevier B. V. All rights reserved.