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 journalArticle

Abstract

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
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 2010

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Graphite
Photoemission
Superconducting materials
photoelectric emission
graphite
Superconductivity
Fermi level
superconductivity
Photons
thresholds
energy
photons

Keywords

  • CaC
  • Graphite intercalation compound
  • Resonant photoemission spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

Cite this

Photoemission study of Ca-intercalated graphite superconductor CaC 6 . / Okazaki, Hiroyuki; Yoshida, Rikiya; Iwai, Keisuke; Noami, Kengo; Muro, Takayuki; Nakamura, Tetsuya; Wakita, Takanori; Muraoka, Yuji; Hirai, Masaaki; Tomioka, Fumiaki; Takano, Yoshihiko; Takenaka, Asami; Toyoda, Masahiro; Oguchi, Tamio; Yokoya, Takayoshi.

In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

Research output: Contribution to journalArticle

Okazaki, H, Yoshida, R, Iwai, K, Noami, K, Muro, T, Nakamura, T, Wakita, T, Muraoka, Y, Hirai, M, Tomioka, F, Takano, Y, Takenaka, A, Toyoda, M, Oguchi, T & Yokoya, T 2010, 'Photoemission study of Ca-intercalated graphite superconductor CaC 6 ', Physica C: Superconductivity and its Applications, vol. 470, no. SUPPL.1. https://doi.org/10.1016/j.physc.2009.10.039
Okazaki, Hiroyuki ; Yoshida, Rikiya ; Iwai, Keisuke ; Noami, Kengo ; Muro, Takayuki ; Nakamura, Tetsuya ; Wakita, Takanori ; Muraoka, Yuji ; Hirai, Masaaki ; Tomioka, Fumiaki ; Takano, Yoshihiko ; Takenaka, Asami ; Toyoda, Masahiro ; Oguchi, Tamio ; Yokoya, Takayoshi. / Photoemission study of Ca-intercalated graphite superconductor CaC 6 In: Physica C: Superconductivity and its Applications. 2010 ; Vol. 470, No. SUPPL.1.
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