Covalent metals, such as MgB2 and the alkali-doped fullerenes, form an unusual class of superconductors. The mechanism of superconductivity in a new member of this family — the silicon clathrates — has now been determined.
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Crespi, V. Clathrates join the covalent club. Nature Mater 2, 650–651 (2003). https://doi.org/10.1038/nmat990
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DOI: https://doi.org/10.1038/nmat990
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