Universal transport in two-dimensional granular superconductors

被引：52
|
作者：
Frydman, A [1 ]
Naaman, O
Dynes, RC
机构：
[1] Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 05期
关键词：
D O I：
10.1103/PhysRevB.66.052509
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The transport properties of quench condensed granular superconductors (Pb, Sn, and Pb-Ag films) are presented and analyzed. These systems exhibit transitions from insulating to superconducting behavior as a function of intergrain spacing. Superconductivity is characterized by broad transitions in which the resistance drops exponentially with reducing temperature. The slope of the log R versus T curves turns out to be universally dependent on the normal state film resistance for all measured granular systems. It does not depend on the material, critical temperature, geometry, or experimental setup. We discuss possible physical scenarios to explain these findings.
引用
收藏
页码：525091 / 525094
页数：4
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