Hopping conductivity in granular metals near the insulator–metal transition
Hopping conductivity in granular metals near the insulator–metal transition
复制标题
绝缘体-金属过渡附近粒状金属的跳跃电导率
DOI：
10.1016/s0378-4371(00)00527-6
复制
发表时间：
2001
影响因子：
3.3
通讯作者：
A. Likalter
中科院分区：
文献类型：
--
作者：
A. Likalter
本文发展了金属颗粒在介质基体中的激活跳跃电导的逾渗理论。库仑间隙，减少筛选，已被证明是关闭的逾渗阈值。霍尔常数已估计假设更大的迁移率的空穴相比，由于较小的变化，在离子化电位的晶粒比电子的亲和力。电导率已被计算为金属的体积分数和温度的函数。包括电子在库仑势威尔斯中的局域化和晶粒的多重电离在内的一些因素被发现是通常被称为可变范围跳跃的温度依赖性的原因。
Percolation theory of activated hopping conductivity on metal grains embedded in a dielectric matrix has been developed. The Coulomb gap, reduced by screening, has been shown to close at the percolation threshold. The Hall constant has been estimated assuming greater mobility of holes compared to that of electrons due to smaller variation in the ionization potential of grains than in the electron affinity. The electric conductivity has been calculated as a function of the volume fraction of metal and the temperature. A few factors including localization of electrons in the Coulomb potential wells and multiple ionization of grains have been found responsible of the temperature dependence usually referred to as the variable range hopping.