Universal character of CoO2 plane studied by high-resolution angle-resolved photoemission

T. Arakane; T. Sato; T. Takahashi; H. Ding; T. Fujii; A. Asamitsu

doi:10.1016/j.physb.2007.10.092

Universal character of CoO₂ plane studied by high-resolution angle-resolved photoemission

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

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

1 Citation (Scopus)

Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy on M_x CoO₂ (M: Na, K, Rb) to clarify the band dispersion and Fermi surface inherent to CoO₂ plane. We have found that a_{1 g} band which forms a large hexagonal Fermi surface centered at Γ(A) point shows a dispersion kink at approximately 100 meV binding energy, irrespective of the species of alkali metals and its content (x). We discuss the origin of kink in the dispersion in terms of the strong mass renormalization due to electron-phonon interaction and/or the hybridization of a_{1 g} and e_g^′ bands.

Original language	English
Pages (from-to)	1086-1088
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.092
Publication status	Published - 2008 Apr 1

Keywords

ARPES
Cobaltate
M CoO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2007.10.092

Cite this

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title = "Universal character of CoO2 plane studied by high-resolution angle-resolved photoemission",

abstract = "We have performed high-resolution angle-resolved photoemission spectroscopy on Mx CoO2 (M: Na, K, Rb) to clarify the band dispersion and Fermi surface inherent to CoO2 plane. We have found that a1 g band which forms a large hexagonal Fermi surface centered at Γ(A) point shows a dispersion kink at approximately 100 meV binding energy, irrespective of the species of alkali metals and its content (x). We discuss the origin of kink in the dispersion in terms of the strong mass renormalization due to electron-phonon interaction and/or the hybridization of a1 g and eg′ bands.",

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T1 - Universal character of CoO2 plane studied by high-resolution angle-resolved photoemission

AU - Arakane, T.

AU - Sato, T.

AU - Takahashi, T.

AU - Ding, H.

AU - Fujii, T.

AU - Asamitsu, A.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We have performed high-resolution angle-resolved photoemission spectroscopy on Mx CoO2 (M: Na, K, Rb) to clarify the band dispersion and Fermi surface inherent to CoO2 plane. We have found that a1 g band which forms a large hexagonal Fermi surface centered at Γ(A) point shows a dispersion kink at approximately 100 meV binding energy, irrespective of the species of alkali metals and its content (x). We discuss the origin of kink in the dispersion in terms of the strong mass renormalization due to electron-phonon interaction and/or the hybridization of a1 g and eg′ bands.

AB - We have performed high-resolution angle-resolved photoemission spectroscopy on Mx CoO2 (M: Na, K, Rb) to clarify the band dispersion and Fermi surface inherent to CoO2 plane. We have found that a1 g band which forms a large hexagonal Fermi surface centered at Γ(A) point shows a dispersion kink at approximately 100 meV binding energy, irrespective of the species of alkali metals and its content (x). We discuss the origin of kink in the dispersion in terms of the strong mass renormalization due to electron-phonon interaction and/or the hybridization of a1 g and eg′ bands.

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KW - Cobaltate

KW - M CoO

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