Alexander P. Koufos and Dimitrios A. Papaconstantopoulos Electronic structure of francium International Journal of Quantum Chemistry 113
Little is known about the properties of the heaviest alkali metal, francium. This article provides the first electronic structure study of francium while completing a systematic study of the other alkalis. Theoretically, the alkalis should become superconductors under pressure. Lithium has been the only one experimentally verified. This study suggests that the increased d-character of the states at the Fermi level is the mechanism for superconductivity under pressure.
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