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arXiv 0907.5346cond-mat.str-elcond-mat.other
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电荷密度波增强了锰氧化物的电子噪声

Charge density waves enhance the electronic noise of manganites

C. Barone, A. Galdi, N. Lampis, L. Maritato, F. Miletto Granozio, S. Pagano, P. Perna, M. Radovic, U. Scotti di Uccio

摘要:

报道了Pr_{0.7} Ca_{0.3} MnO_{3}外延薄膜在室温至160 K温度范围内的输运和噪声特性。结果表明,宽带1/f噪声特性和电阻对电场的依赖性是一致的集体电输运的想法,在经典模型的滑动电荷密度波。另一方面,观察结果不能与电荷有序化和电荷熔化的标准模型相一致。在方法上,建议考虑噪声谱分析作为一种独特的工具,用于识别在这种高度相关的系统中的传输机制。在此基础上,电输运被认为是理解锰氧化物绝缘、电荷调制基态性质的最有效途径之一。

英文摘要:

The transport and noise properties of Pr_{0.7}Ca_{0.3}MnO_{3} epitaxial thin films in the temperature range from room temperature to 160 K are reported. It is shown that both the broadband 1/f noise properties and the dependence of resistance on electric field are consistent with the idea of a collective electrical transport, as in the classical model of sliding charge density waves. On the other hand, the observations cannot be reconciled with standard models of charge ordering and charge melting. Methodologically, it is proposed to consider noise-spectra analysis as a unique tool for the identification of the transport mechanism in such highly correlated systems. On the basis of the results, the electrical transport is envisaged as one of the most effective ways to understand the nature of the insulating, charge-modulated ground states in manganites.

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