Electronic structure of MxCoO2 (M: Na, K, and Rb) studied by high-resolution angle-resolved photoemission spectroscopy

T. Arakane, T. Sato, T. Takahashi, T. Fujii, A. Asamitsu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have performed angle-resolved photoemission spectroscopy (ARPES) on MxCoO2 (M: Na, K, and Rb) to clarify electronic structure essential to the bulk CoO2 plane. By the bulk-sensitive ARPES measurement of Na0.72CoO2 using soft X-ray (hν = 600 eV) as a excitation source, we found a large holelike a1g Fermi surface centered at Γ(A) point but not around K(H) point, quite similar to the previous ARPES results using ultraviolet light. By elucidating the alkali-metal dependence of Fermi surface, we also found that appearance of large a1g Fermi surface and the absence of eg pocket is a common feature of MxCoO2, irrespective of the alkali metal.

Original languageEnglish
Pages (from-to)149-151
Number of pages3
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.
Publication statusPublished - 2007 Oct 1


  • Cobalt oxide
  • Electronic structure

ASJC Scopus subject areas

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

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