Photoemission study of Ca-intercalated graphite superconductor CaC 6

Hiroyuki Okazaki, Rikiya Yoshida, Keisuke Iwai, Kengo Noami, Takayuki Muro, Tetsuya Nakamura, Takanori Wakita, Yuji Muraoka, Masaaki Hirai, Fumiaki Tomioka, Yoshihiko Takano, Asami Takenaka, Masahiro Toyoda, Tamio Oguchi, Takayoshi Yokoya

Research output: Contribution to journalArticlepeer-review


In this work, we have performed resonant photoemission studies of Ca-intercalated graphite superconductor CaC6. Using photon energy of the Ca 2p-3d threshold, the photoemission intensity of the peak at Fermi energy (EF) is resonantly enhanced. This result provides spectroscopic evidence for the existence of Ca 3d states at EF, and strongly supports that Ca 3d state plays a crucial role for the superconductivity of this material with relatively high Tc.

Original languageEnglish
Pages (from-to)S637-S638
JournalPhysica C: Superconductivity and its Applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec


  • CaC
  • Graphite intercalation compound
  • Resonant photoemission spectroscopy


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