Studies of ultra-thin Bi films quench-condensed on solid inert gas and other substrates

Sambandamurthy, G and Das, K and Moorthy, VHS and Chandrasekhar, N (1999) Studies of ultra-thin Bi films quench-condensed on solid inert gas and other substrates. In: Current Science, 77 (6). pp. 794-802.

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Abstract

This paper reports an experimental study of quench-condensed disordered ultra-thin films of Bi, where localization effects and superconductivity compete. Experiments are done with bare substrates and/or underlayers of solid Xe, Ge and Sb. The deposition temperature is also varied. We have observed absence of superconductivity in low dielectric constant substrates even though the sheet resistance is varied over 5 orders of magnitude. RHEED studies indicate that quantum size effects are important in these systems. Apart from stabilizing the amorphous phase in Bi, the Ge underlayer is found to nucleate superconductivity when the Bi was quench-condensed at 15 K. The macroscopic properties of the film are dependent both on the underlayer as well as the deposition temperature.

Item Type:	Journal Article
Publication:	Current Science
Publisher:	Indian Academy of Sciences
Additional Information:	The copyright belongs to Indian Academy of Sciences.
Keywords:	thin films;superconductivity;micro structural disorder
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	04 Mar 2005
Last Modified:	19 Sep 2010 04:15
URI:	http://eprints.iisc.ac.in/id/eprint/1522

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