介电颗粒金属交流电导的纳米结构起源：Co_20（ZrO_2）_80的研究
The nanostructural origin of the ac conductance in dielectric granular metals: the case study of Co_20(ZrO_2)_80
摘要：
我们表明，这是所需的纳米结构颗粒Co20（ZrO 2）80薄膜，以产生一个交流响应，如一个普遍观察到的各种各样的介电材料。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的颗粒之间的电容性电导。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。
英文摘要：
We 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 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.
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