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

Gupta, Das K and Sambandamurthy, G and Soman, SS and Chandrasekhar, N (2001) Possible robust insulator-superconductor transition on solid inert gas and other substrates. In: Physical Review B, 6310 (10). 63, 104502-63, 104505.

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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 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.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Keywords:	Ultrathin Metal-Films;Josephson-Junction Arrays;Pb Films;Coulomb Gap;Thin-Films;Conductivity;Vortices;Localization;Temperature;Transport
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	10 Feb 2010 07:13
Last Modified:	19 Sep 2010 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/17306

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