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

doi:10.1016/j.physc.2007.03.502

Electronic structure of M_xCoO₂ (M: Na, K, and Rb) studied by high-resolution angle-resolved photoemission spectroscopy

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

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Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on M_xCoO₂ (M: Na, K, and Rb) to clarify electronic structure essential to the bulk CoO₂ plane. By the bulk-sensitive ARPES measurement of Na_0.72CoO₂ using soft X-ray (hν = 600 eV) as a excitation source, we found a large holelike a_1g 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 a_1g Fermi surface and the absence of e_g^′ pocket is a common feature of M_xCoO₂, irrespective of the alkali metal.

Original language	English
Pages (from-to)	149-151
Number of pages	3
Journal	Physica C: Superconductivity and its Applications
Volume	463-465
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/j.physc.2007.03.502
Publication status	Published - 2007 Oct 1

Keywords

ARPES
Cobalt oxide
Electronic structure

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10.1016/j.physc.2007.03.502

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

abstract = "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.",

keywords = "ARPES, Cobalt oxide, Electronic structure",

author = "T. Arakane and T. Sato and T. Takahashi and T. Fujii and A. Asamitsu",

note = "Funding Information: We thank T. Dobashi, S. Souma, H.-B. Yang, S.-C. Wang, T. Muro, T. Yokoya, K. Ono, and M. Kubota, for their help in the experiment. This work was supported by a grant from the JSPS, MEXT, and CREST-JST of Japan. ",

year = "2007",

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day = "1",

doi = "10.1016/j.physc.2007.03.502",

language = "English",

volume = "463-465",

pages = "149--151",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Electronic structure of MxCoO2 (M: Na, K, and Rb) studied by high-resolution angle-resolved photoemission spectroscopy

AU - Arakane, T.

AU - Sato, T.

AU - Takahashi, T.

AU - Fujii, T.

AU - Asamitsu, A.

N1 - Funding Information: We thank T. Dobashi, S. Souma, H.-B. Yang, S.-C. Wang, T. Muro, T. Yokoya, K. Ono, and M. Kubota, for their help in the experiment. This work was supported by a grant from the JSPS, MEXT, and CREST-JST of Japan.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - 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.

AB - 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.

KW - ARPES

KW - Cobalt oxide

KW - Electronic structure

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DO - 10.1016/j.physc.2007.03.502

M3 - Article

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SN - 0921-4534

VL - 463-465

SP - 149

EP - 151

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.

ER -

Electronic structure of M_xCoO₂ (M: Na, K, and Rb) studied by high-resolution angle-resolved photoemission spectroscopy

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Keywords

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