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首页> 外文期刊>Physica, B. Condensed Matter >Transport behavior and mechanism of conduction of simultaneously substituted y and Fe in La_(0.7)Ba_(0.3)MnO_3 perovskite
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Transport behavior and mechanism of conduction of simultaneously substituted y and Fe in La_(0.7)Ba_(0.3)MnO_3 perovskite

机译：La_（0.7）Ba_（0.3）MnO_3钙钛矿中同时取代的y和Fe的传输行为和传导机理

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摘要

The electrical properties and the mechanism of conduction of the simultaneously substituted La_(0.7-x)Y_xBa_(0.3)Mn_(1-x)Fe_xO_3 perovskite (0≤x≤0.30) have been studied. The insertion of Y~3 and Fe~3 ions in the parent compound La_(0.7)Ba_(0.3)MnO_3 leads to an increase of the resistivity. The undoped sample (x=0) shows a metallic behavior, which can be fitted by the relation ρ(T)=ρ_0ρ_2T~2ρ_(4.5)T~(4.5), indicating the importance of electronmagnon scattering effects in this material. All the other samples (x≥0.10) are semiconductors throughout the studied temperature range (80290 K). Several models have been used to fit their temperature-dependent resistivity: thermal activation, adiabatic nearest-neighbor hopping of small polarons (Holstein theory) and variable range hopping (VRH) models. The fits show that the electronic transport in semiconducting La_(0.7-x)Y_xBa_(0.3)Mn_(1-x)Fe_xO_3 is well described and dominated by the VRH mechanism, for which the hopping distance (a) grows with increasing Fe~3 doping, thus increasing the average hopping energy W.
机译：研究了同时取代的La_（0.7-x）Y_xBa_（0.3）Mn_（1-x）Fe_xO_3钙钛矿（0≤x≤0.30）的电学性质和导电机理。母体化合物La_（0.7）Ba_（0.3）MnO_3中Y〜3和Fe〜3离子的插入导致电阻率增加。未掺杂样品（x = 0）显示出金属行为，可以通过关系ρ（T）=ρ_0ρ_2T〜2ρ_（4.5）T〜（4.5）拟合，表明该材料中电子磁振子散射效应的重要性。所有其他样品（x≥0.10）在整个研究温度范围（80290 K）中均为半导体。已经使用了几种模型来拟合其随温度变化的电阻率：热活化，小极化子的绝热最近邻跳跃（Holstein理论）和可变范围跳跃（VRH）模型。拟合表明，半导体La_（0.7-x）Y_xBa_（0.3）Mn_（1-x）Fe_xO_3中的电子输运被很好地描述并受VRH机制支配，为此，跳跃距离（a）随着Fe〜3的增加而增长掺杂，从而增加了平均跳跃能量W。

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