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首页> 外文期刊>Solid State Communications >Electrical conductivity and low field magnetoresistance in polycrystalline La1-xKxMnO3 pellets prepared by pyrophoric method
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Electrical conductivity and low field magnetoresistance in polycrystalline La1-xKxMnO3 pellets prepared by pyrophoric method

机译：发火法制备的La1-xKxMnO3多晶小球的电导率和低场磁电阻

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摘要

Electrical conductivity and magnetoresistance of a series of monovalent (K) doped La1-xKxMnO3 polycrystalline pellets prepared by pyrophoric method have been reported. K doping increases the conductivity as well as the Curie temperature (T-C) of the system. Curie temperature increases from 260 to 309 K with increasing K content. Above the metal-insulator transition temperature (T > T-MI), the electrical resistivity is dominated by adiabatic polaronic model, while in the ferromagnetic region (50 < T < T-MI), the resistivity is governed by several electron scattering processes. Based on a scenario that the doped manganites consist of phase separated ferromagnetic metallic and paramagnetic insulating regions, all the features of the temperature variation of the resistivity between similar to 50 and 300 K are described very well by a single expression. All the K doped samples clearly display the existence of strongly field dependent resistivity minimum close to similar to 30 K. Charge carrier tunneling between antiferromagnetically coupled grains explains fairly well the resistivity minimum in monovalent (K) doped lanthanum manganites. Field dependence of magnetoresistance at various temperatures below T-C is accounted fairly well by a phenomenological model based on spin polarized tunneling at the grain boundaries. The contributions from the intrinsic part arising from DE mechanism, as well as, the part originating from intergrannular spin polarized tunneling are also estimated. (c) 2005 Elsevier Ltd. All rights reserved.
机译：已经报道了通过自燃方法制备的一系列单价（K）掺杂的La1-xKxMnO3多晶颗粒的电导率和磁阻。 K掺杂增加了系统的电导率以及居里温度（T-C）。居里温度随着K含量的增加从260 K升高到309K。在金属-绝缘体转变温度以上（T> T-MI），电阻率由绝热极化子模型控制，而在铁磁区域（50

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