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Gallium arsenide: not really super.

Scientists who announced last spring that they had made gallium arsenide conduct electricity with no resistance at 10 kelvins (SN: 6/15/91, p. 372) now say that a contaminant causes this superconductivity. Eicke R. Weber at the Lawrence Berkeley Laboratory in Berkeley, Calif., reports that indium had diffused from the template upon which he and his co-workers made the gallium arsenide sample. The indium settled into the lattice of the semiconductor, altering its electrical properties. He and his colleagues are still unsure of the mechanism of this superconductivity, but Weber says they can now consistently make layered thin films with indium and gallium arsenide that show this property. He hopes one day to put this material to use in electronic components.
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Title Annotation:superconductor
Author:Pennisi, Elizabeth
Publication:Science News
Date:Dec 14, 1991
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