Superconductivity is observed both in silicon and germanium polyhedral materials in Ba 24Si 100 and Ba 24Ge 100. The former superconducts at T c=1.4K and its T c decreases upon pressure, while the latter is superconducting at 150mK after the electronic phase transition at 200K and its T c rises to 3.8K with pressure. These characteristics are comparably discussed from the viewpoint of the density of states at the Fermi level experimentally derived both in Ba 24Si 100 and Ba 24Ge 100 from soft X-ray photoelectron spectroscopy and magnetic susceptibility measurements. [All rights reserved Elsevier].
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