强关联系统中NonOhmic传导的标度性
Scaling of NonOhmic Conduction in Strongly Correlated Systems
摘要：
本文用一种新的标度方法分析了五种锰氧化物体系金属-绝缘体转变附近的非线性I-V数据。一个指数，称为非线性指数，和非线性的发病领域，这两个特征的系统研究中，从分析中获得。的发病领域被发现有一个令人不安的低价值证实理论预测的电子软相。发现多晶样品的MIT以上和以下的标度函数是相同的，但具有不同的指数，这归因于MIT温度的分布。锰氧化物中结垢的适用性强调了无序系统对电场的普遍响应。
英文摘要：
A new scaling formalism is used to analyze nonlinear I-V data in the vicinity of metal-insulator transitions (MIT) in five manganite systems. An exponent, called the nonlinearity exponent, and an onset field for nonlinearity, both characteristic of the system under study, are obtained from the analysis. The onset field is found to have an anomalously low value corroborating the theoretically predicted electronically soft phases. The scaling functions above and below the MIT of a polycrystalline sample are found to be the same but with different exponents which are attributed to the distribution of the MIT temperatures. The applicability of the scaling in manganites underlines the universal response of the disordered systems to electric field.
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