Fluctuation conductivity in insulator-superconductor transitions with dissipation.
Fluctuation conductivity in insulator-superconductor transitions with dissipation.
复制标题
绝缘体-超导体转变中电导率的波动与耗散。
DOI：
10.1103/physrevlett.84.737
复制
发表时间：
1999
影响因子：
8.6
通讯作者：
P. Phillips
中科院分区：
文献类型：
--
作者：
D. Dalidovich;P. Phillips
我们在此分析由欧姆电阻分流的二维约瑟夫森结阵列中临界点附近的涨落电导率。我们发现，在高斯水平下，当耗散足够小时，电导率对T/m（m是关联长度的倒数）具有对数依赖性。在重正化经典区域中，当考虑涨落时，这种对数依赖性导致在低温到中等温度下电阻率趋于平稳。然而，我们表明这种趋势在T = 0时并不持续，此时电阻率消失。讨论了电阻率趋于平稳与颗粒状超导体中低温输运的可能关系。
We analyze here the fluctuation conductivity in the vicinity of the critical point in a 2D Josephson junction array shunted by an Ohmic resistor. We find that, at the Gaussian level, the conductivity acquires a logarithmic dependence on T/m ( m is the inverse correlation length) when the dissipation is sufficiently small. In the renormalized classical regime, this logarithmic dependence gives rise to a leveling off of the resistivity at low to intermediate temperatures when fluctuations are included. We show, however, that this trend does not persist to T=0 at which point the resistivity vanishes. The possible relationship of the leveling of the resistivity to the low temperature transport in granular superconductors is discussed.