Observation of the insulator–superconductor transition on solid inert gas and other substrates

Gupta, Das K and Sambandamurthy, G and Soman, Swati S and Chandrasekhar, N (2001) Observation of the insulator–superconductor transition on solid inert gas and other substrates. In: Journal of Physics: Condensed Matter, 13 (5). pp. 889-899.

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Abstract

Observations of the insulator–superconductor transition in amorphous ultrathin films of Bi deposited on solid xenon are presented. The resistance separatrix is found to be close to $h/4e^2$ and the crossover thickness close to 25 Å for all substrates. I–V studies and Aslamazov–Larkin analyses indicate that the superconductivity is inhomogeneous. Screening effects are observed, with the transition temperature increasing as the relative permeability of the substrate is increased, when studying films on quartz and Ge. The resistance separatrix that defines the transition remains unaffected. These results may be qualitatively understood in terms of a percolation-type model.

Item Type:	Journal Article
Publication:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Jun 2006
Last Modified:	19 Sep 2010 04:29
URI:	http://eprints.iisc.ac.in/id/eprint/7657

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