Abstract
Superconductivity is observed both in silicon and germanium polyhedral materials in Ba24Si100 and Ba24Ge100. The former superconducts at Tc=1.4K and its Tc decreases upon pressure, while the latter is superconducting at 150mK after the electronic phase transition at 200K and its Tc 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 Ba24Si100 and Ba24Ge100 from soft X-ray photoelectron spectroscopy and magnetic susceptibility measurements.
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