We study the electronic structure and superconducting transition of silicon clathrate (formula presented) using photoemission spectroscopy. We observe a narrow band at the Fermi level (formula presented) whose width (∼0.3 eV) is substantially smaller than that of band structure calculations (∼1.5 eV). Ultrahigh-resolution measurements show a superconducting gap at 5.4 K (formula presented) Fine structures associated with phonons are observed within 70 meV of (formula presented) These results characterize (formula presented) as a weak-coupling superconductor most probably driven by phonon.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics