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- W919944341 abstract "摘要 有效介质理论自洽方程被用来研究非磁性半导体材料的异常磁电阻效应. 通过建立两组分无序电导网络，同时引入组分的霍尔效应，计算了体系的有效电导张量随磁场和组分浓度的变化关系.结果表明，当两种组分具有不同类型的载流子时，体系中各组分零场电阻的差异将导致在垂直磁场和平行磁场方向上产生异常的磁电阻效应.这些宏观的磁电阻效应来源于体系中的非均匀性，并与组分的几何逾渗结构具有明显的关联. 关键词: 异常磁电阻效应 / 非磁性半导体 / 有效介质近似 Abstract The self-consistent effective-medium approximation is used to study the extraordinary magnetoresistance effect observed in nonmagnetic semiconductors. The inhomogeneous materials are treated as a three-dimensional resistor network of binary disorder, where the receptivity of each component is a tensor describing both the zero-field resistance and the Hall effect. The effective conductivity tensor of the total system is calculated with applied magnetic field. The resulting transversal magnetoresistance, longitudinal magnetoresistance and effective Hall coefficient are shown for different component concentrations and magnetic fields. When the components have two different types of charge carriers, and the mismatch between the zero-resistivity is enlarged, the macroscopic magnetoresisance exhibits complex behaviors which are related closely with the formation of the percolation structure in the inhomogeneous system. Keywords: extraordinary magnetoresistance / nonmagnetic semiconductor / effective medium approximation 作者及机构信息 宋亚舞, 孙 华 1. 苏州大学物理科学与技术学院，江苏省薄膜材料重点实验室，苏州 215006 基金项目: 国家自然科学基金(批准号:10404018)资助的课题. Authors and contacts Song Ya-Wu, Sun Hua 1. 苏州大学物理科学与技术学院，江苏省薄膜材料重点实验室，苏州 215006 参考文献 施引文献" @default.
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- W919944341 date "2008-01-01" @default.
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- W919944341 title "Extraordinary magnetoresistance in nonmagnetic semiconductors: The effective-medium approximation" @default.
- W919944341 doi "https://doi.org/10.7498/aps.57.7178" @default.
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