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Superconductivity in metal-semiconductor eutectic alloys

Tsuei, C. C. and Johnson, W. L. (1974) Superconductivity in metal-semiconductor eutectic alloys. Physical Review B, 9 (11). pp. 4742-4751. ISSN 0163-1829. doi:10.1103/PhysRevB.9.4742.

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In an eutectic alloy obtained by melting the constituents, alternating domains of metal and semiconductor can exist in a well-defined microscopic array. The possibility of superconductivity arising from an interface interaction between the metal and semiconductor has been investigated. Superconductivity has been observed as a bulk property of some eutectic alloys (e.g., Al-Si and Al-Ge). Transition temperatures well in excess of those for the pure metal were found. The effect of rapid cooling the alloys from the liquid state on the microstructure and on the superconducting properties has been studied. It was found that a decrease in the characteristic domain sizes of the metal and semiconductor was accompanied by an increase of the superconducting transition temperature of the alloy. The results suggest that the enhancement of Tc depends on the Fermi energy of the metal. In metal-metal eutectic systems with comparable microstructure, no increase of Tc was observed. Several explanations of the experimental findings are considered. The exciton mechanism discussed by Ginzburg and by Allender, Bray, and Bardeen is considered as a possible means to account for the enhancements of the metal Tc's.

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Additional Information:©1974 The American Physical Society. Received 12 October 1973. The authors wish to thank Professor Pol Duwez for his advice throughout this work. We are grateful for the assistance provided by the technical staff of Keck Laboratory. Work supported by the U. S. Atomic Energy Commission.
Issue or Number:11
Record Number:CaltechAUTHORS:TSUprb74
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5131
Deposited By: Tony Diaz
Deposited On:03 Oct 2006
Last Modified:08 Nov 2021 20:22

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