Nanostructural origin of the ac conductance in dielectric granular metals: The case study of Co20(ZrO2)80
Nanostructural origin of the ac conductance in dielectric granular metals: The case study of Co20(ZrO2)80
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介电颗粒金属中交流电导的纳米结构起源：Co20(ZrO2)80 的案例研究
DOI：
10.1063/1.2766858
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Varela
中科院分区：
文献类型：
--
作者：
Z. Konstantinović;M. G. D. Muro;X. Batlle;A. Labarta;M. Varela
作者表明，这是颗粒状Co20（ZrO 2）80薄膜中所需的纳米结构，以产生交流响应，例如在各种各样的介电材料中普遍观察到的响应。Co颗粒的双峰尺寸分布产生随机竞争的电导通道，其允许热辅助隧穿通过小颗粒和更大颗粒之间的电容电导，所述更大颗粒进一步分开。由一个简单的立方随机电阻-电容网络的模型定量描述的实验结果作为温度和频率的函数，并使控制样品的交流响应的微观参数的测定。
The authors show which is the nanostructure required in granular Co20(ZrO2)80 thin films to produce an ac response such as the one that is universally observed in a very wide variety of dielectric materials. A bimodal size distribution of Co particles yields randomly competing conductance channels which allow both the thermally assisted tunneling through small particles and capacitive conductance among larger particles that are further apart. A model consisting on a simple cubic random resistance-capacitor network describes quantitatively the experimental results as functions of temperature and frequency, and enables the determination of the microscopic parameters controlling the ac response of the samples.