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

K. Das Gupta; G. Sambandamurthy; Swati S. Soman; N. Chandrasekhar

doi:10.1103/PhysRevB.63.104502

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

K. Das Gupta, G. Sambandamurthy, Swati S. Soman, N. Chandrasekhar

DOI 10.1103/PhysRevB.63.104502 · Physical Review B

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Abstract

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 εr 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/4e2 and the crossover thickness close to 25 Å 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.8	Pressure not reported	unknown
Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.2	Pressure not reported	unknown
Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.42	Pressure not reported	unknown