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Superconductivity in rapidly quenched metallic systems with nanoscale structure

Goswami, R and Banerjee, S and Chattopadhyay, K and Raychaudhuri, AK (1993) Superconductivity in rapidly quenched metallic systems with nanoscale structure. In: Journal of Applied Physics, 73 (6). pp. 2934-2940.

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Abstract

Nanocomposites of Al?In, Al?Pb, and Zn?Pb have been prepared and characterized using rapid quenching techniques and the nature of superconducting transitions in them has been studied by resistivity measurements. The precipitated second phases (In and Pb) have particle sizes (d) of a few tens of nanometers such that ?0?d?dmin, where ?0 is the superconducting zero temperature coherence length and dmin is the minimum particle size that supports superconductivity. The onset of superconductivity generally starts in samples with d??0 and progressively other grains with d??0 become superconducting. We suggest that the proximity effect of the matrix plays a significant role. In an Al?In system, even with 40?wt.% In, the zero resistivity state is obtained at T?1.33 times the Tc of Al. But in Al?Pb and Zn?Pb, the zero resistivity state is obtained at T?4 and 5 times the Tc of Al and Zn with only 10�15 wt?% Pb, respectively.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Mar 2011 07:10
Last Modified: 20 Oct 2011 05:46
URI: http://eprints.iisc.ernet.in/id/eprint/35846

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