Electrical properties of Al-In-Sn alloys directionally solidified in high and low gravitational fields |
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Authors: | M K Wu J R Ashburn P A Curreri W F Kaukler |
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Affiliation: | (1) Department of Physics, The University of Alabama, Huntsville, AL;(2) Department of Physics, The University of Alabama, Huntsville, AL;(3) Department of Chemistry, The University of Alabama, Huntsville, AL;(4) Space Science Laboratory, NASA/Marshall Space Flight Center, Marshall Space Flight Center, 35812, AL |
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Abstract: | Al-ln-Sn alloys have been directionally solidified in the NASA KC-135 aircraft which flies a series of parabolas to generate
high (high-g) and low gravity (low-g) forces parallel to the longitudinal growth axis. Thus, for a given sample successive
sections can be identified which were solidified in high-g and in low-g. Measurements on the electronic properties of the
samples reveal that (1) the resistivity of the low-g sections is larger (about a factor of 10) than that of the high-g sections;
(2) the low-g sections behave conductively like a semi-metal, while the high-g sections are essentially metallic; and (3)
both high-g and low-g sections are superconducting but the superconducting transition temperature of the low-g sections is
1 K higher than that of the high-g sections. |
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