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Insulator superconductor transition on solid inert gas substrates
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 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
and the crossover thickness close to 25 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.Comment: Submitted to LT23 Proceeding
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