Experimental evidence for a collective insulating state in two-dimensional superconductors
Experimental evidence for a collective insulating state in two-dimensional superconductors
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DOI：
10.1103/physrevlett.94.017003
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发表时间：
2005-01-14
影响因子：
8.6
通讯作者：
Shahar, D
中科院分区：
文献类型：
--
作者：
Sambandamurthy, G;Engel, LW;Shahar, D
我们提出的电流-电压特性的实验研究结果在一个强磁场（B）的无序，超导，非晶氧化铟薄膜。随着B强度的增加，超导性降低，直到临界场（B-c），其中系统被迫进入绝缘状态。我们发现，在绝缘阶段测量的微分电导突然消失低于一个明确的温度，导致在一个明确的阈值传导。我们的结果表明，在高B的二维超导体中出现了一个新的集体态。
We present the results of an experimental study of the current-voltage characteristics in a strong magnetic field (B) of disordered, superconducting, thin films of amorphous indium oxide. As the B strength is increased superconductivity degrades, until a critical field (B-c) where the system is forced into an insulating state. We show that the differential conductance measured in the insulating phase vanishes abruptly below a well-defined temperature, resulting in a clear threshold for conduction. Our results indicate that a new collective state emerges in two-dimensional superconductors at high B.