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首页> 外文期刊>Solid State Communications >Electrical and thermal transport properties of the Pr-doped La0.9-xPrxTe0.1MnO3 (0 <= x <= 0.9) manganites
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Electrical and thermal transport properties of the Pr-doped La0.9-xPrxTe0.1MnO3 (0 <= x <= 0.9) manganites

机译：掺La的La0.9-xPrxTe0.1MnO3（0 <= x <= 0.9）锰的电和热输运性质

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摘要

The effect of Pr doping at the La site on electrical and thermal transport properties of the electron-doped manganites La0.9-xPrxTe0.1MnO3 (0 <= x <= 0.9) has been investigated. For the samples with x <= 0.36, there is a insulator-metal (I-M) transition while the samples with x >= 0.54 display semiconducting behavior over the whole measured temperature range. For x <= 0.36, the thermopower S changes sign from negative to positive with decreasing temperature and the crossover temperature increases with increasing Pr doping content x. For the samples with x >= 0.54, S shows a positive sign over the whole temperature range studied. Both p(T) and S(T) data in the high temperature range can be well described by the variable-range-hopping (VRH) model for all samples studied. In the low temperature region, the p(T) and S(T) data for the sample with x <= 0.36 are analyzed on the basis of the electron-magnon scattering mechanism. As regards the thermal conductivity k(T), the low temperature k peak is suppressed by Pr doping and k decreases with increasing Pr doping level. The result is analyzed as regards the combined effect of the disorder and antiferromagnetic (AFM) interaction induced by Pr doping. (c) 2006 Elsevier Ltd. All fights reserved.
机译：研究了La位置的Pr掺杂对电子掺杂的锰铁矿La0.9-xPrxTe0.1MnO3（0 <= x <= 0.9）的电和热输运性质的影响。对于x <= 0.36的样品，存在一个绝缘体（I-M）过渡，而x> = 0.54的样品在整个测量温度范围内显示出半导体性能。当x <= 0.36时，热功率S随温度降低而从负号变为正号，而交越温度随Pr掺杂含量x的增加而增加。对于x> = 0.54的样品，S在整个研究温度范围内显示正号。高温范围内的p（T）和S（T）数据都可以通过可变范围跳变（VRH）模型针对所有研究的样品很好地描述。在低温区域，基于电子-马农散射机制分析了x <= 0.36的样品的p（T）和S（T）数据。关于热导率k（T），低温k峰通过Pr掺杂被抑制，并且k随着Pr掺杂水平的增加而减小。分析了有关Pr掺杂引起的无序和反铁磁（AFM）相互作用的综合作用的结果。 （c）2006年Elsevier Ltd.版权所有。

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