Possible robust insulator-superconductor transition on solid inert gas and other substrates

被引：9

作者：

Das Gupta, K ^{[1
]}

Sambandamurthy, G ^{[1
]}

Soman, SS ^{[1
]}

Chandrasekhar, N ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.63.104502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present observations of the insulator-superconductor transition in ultrathin films of Bi on amorphous quartz, quartz coated with Ge, and solid xenon condensed on quartz. The relative permeability epsilon (r) ranges from 1.5 for Xe to 15 for Ge. Though we find screening effects as expected, the I-S transition is robust, and unmodified by the substrate. The resistance separatrix is found to be close to h/4e(2) and the crossover thickness close to 25 Angstrom for all substrates. I-V studies and Aslamazov-Larkin analyses indicate superconductivity is inhomogeneous. The transition can be understood in terms of a percolation model.

引用

页数：5

共 40 条

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