Insulator superconductor transition on solid inert gas substrates

Details Insulator superconductor transition on solid inert gas substrates Insulator superconductor transition on solid inert gas substrates

2002-09-02

arxiv.org/abs/cond-mat/0209027v1

Physics

Condensed Matter

Superconductivity

Submitted to LT23 Proceedings

Scientific paper

10.1016/S0921-4526(02)02259-7

We present observations of the insulator-superconductor transition in ultrathin films of Bi on solid xenon condensed on quartz and on Ge 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 $\AA$ for all substrates. I-V studies and Aslamazov-Larkin analyses indicate superconductivity is inhomogeneous. The transition is best described in terms of a percolation model.

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