Direct evidence for cage conduction band in superconducting cement 12CaO.7Al2O3 by low-energy high-resolution photoemission spectroscopy

Seigo Souma, Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Sung Wng Kim, Satoru Matsuishi, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We have performed low-energy high-resolution photoemission spectroscopy of a superconducting cement 12CaO.7Al2O3 (C12A7). By using the bulk-sensitive xenon-plasma light, we clearly observed a small but well-defined peak at the Fermi level (EF). Comparison with the band calculations suggests that the observed near-EF peak is ascribed to the conduction electrons distributed over the crystal cages responsible for the metallic nature and superconductivity of C12A7.

Original languageEnglish
Article number103704
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 2010 Oct


  • 12CaO.7AlO
  • Electronic structure
  • Photoemission spectroscopy
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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