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首页> 外文期刊>Solid State Communications >Low temperature electrical transport in Ag substituted LaMnO_3 polycrystalline pellets prepared by a pyrophoric method
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Low temperature electrical transport in Ag substituted LaMnO_3 polycrystalline pellets prepared by a pyrophoric method

机译：自燃法制备的Ag取代的LaMnO_3多晶颗粒中的低温电传输

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摘要

A detailed investigation of the electrical resistivity of a series of monovalent (Ag) doped polycrystalline La_(1-x)Ag_xMnO_3 pellets with x ranging from 0.05 to 0.30 and measured over the temperature range between 10 and 350 K is reported. La_(1-x)Ag_xMnO_3 compounds have been prepared by a novel pyrophoric technique. XRD analysis of our samples indicates single phasic nature for samples with Ag content ≤ 0.15, while samples with higher Ag content (x ≥ 0.2) show presence of both magnetic perovskite and non-magnetic Ag phases. A sharp insulator-metal transition with T_(MI) close to room temperature arising out of the paramagnetic to ferromagnetic transition, and a large magneto-resistance (MR = ～ 16%) near T_(MI) has been observed for all the Ag doped samples. Between T_C(T_(p1) and 350 K, all the samples show activated conduction following the Emin-Holstein theory of adiabatic small polaron hopping, while at lower temperatures, in the ferromagnetic regime resistivity appears to be governed by various electron scattering processes. Between 20 and 50 K, a distinct minimum for both H = 0 and H = 0.8 T has been observed, which is explained in terms of inelastic scattering and electron-electron interactions.
机译：报告了对一系列单价（Ag）掺杂的多晶La_（1-x）Ag_xMnO_3球粒的电阻率的详细研究，该球粒的x范围为0.05至0.30，并且在10至350 K的温度范围内进行了测量。 La_（1-x）Ag_xMnO_3化合物已通过新型自燃技术制备。我们样品的X射线衍射分析表明，银含量≤0.15的样品具有单相性质，而银含量较高（x≥0.2）的样品则显示出磁性钙钛矿和非磁性Ag相的存在。从所有顺磁性到铁磁性的转变，T_（MI）都接近室温，出现了尖锐的绝缘体-金属转变，并且在所有掺杂的Ag中都观察到在T_（MI）附近有较大的磁阻（MR =〜16％）。样品。在T_C（T_（p1）和350 K之间，所有样品都遵循Emin-Holstein绝热小极化子跳跃的Emin-Holstein理论，而在较低温度下，铁磁状态下的电阻率似乎受各种电子散射过程控制。在20 K和50 K下，观察到H = 0和H = 0.8 T都有明显的最小值，这可以通过非弹性散射和电子-电子相互作用来解释。

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