Magnesium diboride superconducts at an unexpectedly high temperature. It is now clear that the material also has an unusual, but long-sought, 'double energy gap' structure that influences its superconductivity.
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Pickett, W. Mind the double gap. Nature 418, 733–734 (2002). https://doi.org/10.1038/418733a
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DOI: https://doi.org/10.1038/418733a
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