Superconductor-insulator transition in ultrathin Pb films: Localization and superconducting coherence

被引：23
|
作者：
Kagawa, K
Inagaki, K
Tanda, S
机构：
[1] Department of Applied Physics, Hokkaido University
来源：
PHYSICAL REVIEW B | 1996年 / 53卷 / 06期
关键词：
D O I：
10.1103/PhysRevB.53.R2979
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured temperature-dependent resistivities of a set of Pb ultrathin films by repeating in situ deposition at liquid-He temperature. Observed conductance in the fermion region can be described by a single-parameter scaling function (beta function) with a self-consistent theory for localization in two dimensions. Based on estimated values of electrical localization length (xi(loc)) and superconducting coherence length (xi(super)), the superconductor-insulator transition is confirmed to occur at the point where xi(loc)similar to 2 xi(super). Moreover, only samples exhibiting lnT dependence in the fermion region become global coherent superconductors at low temperature.
引用
收藏
页码：R2979 / R2982
页数：4
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