When is a metal not a metal? When it is under high pressure, if it's lithium or sodium. The strange behaviour of dense forms of these elements exposes difficulties with commonly used models of electronic structure.
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Ashcroft, N. Pressure for change in metals. Nature 458, 158–159 (2009). https://doi.org/10.1038/458158a
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DOI: https://doi.org/10.1038/458158a
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