Transition from insulating to non-insulating temperature dependence of the conductivity in granular metals
Transition from insulating to non-insulating temperature dependence of the conductivity in granular metals
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DOI：
10.1209/epl/i2002-00166-9
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发表时间：
2001-09
期刊：
影响因子：
1.8
通讯作者：
K. Efetov;A. Tschersich
中科院分区：
文献类型：
--
作者：
K. Efetov;A. Tschersich
我们考虑在不太低的温度下，在一个颗粒状的正常金属的相互作用。假设所有的弱局域化效应被抑制的温度，我们取代了初始哈密顿由适当的功能的阶段和研究的可能性相变依赖于隧道电导g。它表明，对于任何尺寸，而在小g的电导率随温度呈指数衰减，其温度依赖性是对数在大g。得到的公式进行了比较，与现有的实验和一个很好的协议。
We consider interaction effects in a granular normal metal at not very low temperatures. Assuming that all weak localization effects are suppressed by the temperature we replace the initial Hamiltonian by a proper functional of phases and study the possibility for a phase transition depending on the tunneling conductance g. It is demonstrated for any dimension that, while at small g the conductivity decays with temperature exponentially, its temperature dependence is logarithmic at large g. The formulae obtained are compared with an existing experiment and a good agreement is found.