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

doi:10.1143/JPSJ.76.054704

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	054704
Journal	journal of the physical society of japan
Volume	76
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.76.054704
Publication status	Published - 2007 May

Keywords

ARPES
Cobalt oxide
Electronic structure
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.054704

Cite this

Fermi surface and band dispersions of M _xCoO ₂ (M : Na, K, and Rb) studied by angle-resolved photoemission spectroscopy. / Arakane, Toshiyuki; Sato, Takafumi; Takahashi, Takashi; Ding, Hong; Fujii, Takenori; Asamitsu, Atsushi.

In: journal of the physical society of japan, Vol. 76, No. 5, 054704, 05.2007.

Research output: Contribution to journal › Article › peer-review

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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.",

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