Fermi surface and band dispersions of M xCoO 2 (M: Na, K, and Rb) studied by angle-resolved photoemission spectroscopy

Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Hong Ding, Takenori Fujii, Atsushi Asamitsu

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9 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on M xCoO 2 (M: Na, K, and Rb) with both soft X-ray and ultraviolet light to clarify the electronic structure intrinsic to the bulk CoO 2 plane. We observed a large holelike a 1g Fermi surface centered at the Γ(A) point with no signatures for a theoretically predicted small e′ g hole pocket around the K(H) point, irrespective of the species of alkali metal and its content (x). We also found that the band dispersion near the Fermi level shows a kink structure indicative of the band hybridization and/or the strong mass renormalization due to electron-phonon coupling.

Original languageEnglish
Article number054704
Journaljournal of the physical society of japan
Volume76
Issue number5
DOIs
Publication statusPublished - 2007 May

Keywords

  • ARPES
  • Cobalt oxide
  • Electronic structure
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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