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Electronic transport on doped La0,6D0,4MnO3 ceramic manganites

机译:掺杂La0,6D0,4MnO3陶瓷锰矿上的电子传输

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We have studied magnetotransport in a set of nanocrystalline samples of composition La0,6D0,4MnO3, where the divalent ion is changed. Magnetization results show a paramagnetic transition near room temperature and large differences for ZFC and FC routes. The resistivity shows a broad peak at temperatures between 178 and 267 K, and a minimum near 30 K. Under a magnetic field we see a significant drop in the resistivity with a larger metallic region. The data show that at low temperatures inter-grain tunneling model applies, providing good crossover to the metallic range where scattering in the presence of disorder takes place. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们研究了一组组成为La0,6D0,4MnO3的纳米晶体样品中的磁传输,其中二价离子发生了变化。磁化结果显示,室温附近发生顺磁性转变,ZFC和FC路径差异很大。电阻率在178和267 K之间的温度下显示出一个宽的峰值,在30 K附近出现一个最小值。在磁场下,当金属区域更大时,电阻率会显着下降。数据表明,在低温下可使用晶粒间隧穿模型,该模型可很好地穿越金属区域,在存在杂散的情况下会发生散射。 (c)2006 Elsevier B.V.保留所有权利。

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