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Investigation of activated transport in hole doped rare earth manganites in the high temperature paramagnetic regime

机译:高温顺磁性条件下空穴掺杂稀土锰矿中活化输运的研究

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Electronic transport in the high temperature paramagnetic regime of the colossal magnetoresistive oxides, La(1-x)A(x)MnO(3), A=Ca, Sr, Ba, x similar or equal to 0.1-0.3, has been investigated using resistivity measurements. The main motivation for this work is to relook into the actual magnitude of the activation energy for transport in a number of manganites and study its variation as a function of hole doping (x), average A-site cation radius (< r(A)>), cationic disorder (sigma(2)) and strain (epsilon(zz)). We show that contrary to current practice, the description of a single activation energy in this phase is not entirely accurate. Our results clearly reveal a strong dependence of the activation energy on the hole doping as well as disorder. Comparing the results across different substituent species with different < r(A)> reveals the importance of sigma(2) as a metric to qualify any analysis based on (r(A)). (c) 2006 Elsevier Ltd. All rights reserved.
机译:已使用以下方法研究了巨大的磁阻氧化物La(1-x)A(x)MnO(3)在高温顺磁状态下的电子传输,其中A = Ca,Sr,Ba,x近似或等于0.1-0.3。电阻率测量。这项工作的主要动机是研究在许多锰矿中传输的活化能的实际大小,并研究其随空穴掺杂(x),平均A位阳离子半径(),阳离子紊乱(sigma(2))和应变(epsilon(zz))。我们表明,与当前的实践相反,此阶段中单个活化能的描述并不完全准确。我们的结果清楚地表明了活化能对空穴掺杂和无序的强烈依赖性。比较具有不同的不同取代基物种的结果,揭示了sigma(2)作为衡量基于(r(A))的任何分析的指标的重要性。 (c)2006 Elsevier Ltd.保留所有权利。

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