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  1. 050 理学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

Electronic State of NaxCoO2 Based on the Two Dimensional Triangular Lattice d-p Model

http://hdl.handle.net/10191/26889
http://hdl.handle.net/10191/26889
7fbbd18f-a24e-46e7-bb25-b20f77e96874
名前 / ファイル ライセンス アクション
1003.pdf 1003.pdf (413.3 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-04-16
タイトル
タイトル Electronic State of NaxCoO2 Based on the Two Dimensional Triangular Lattice d-p Model
タイトル
言語 en
タイトル Electronic State of NaxCoO2 Based on the Two Dimensional Triangular Lattice d-p Model
言語
言語 eng
キーワード
主題Scheme Other
主題 Triangular lattice d-p model
キーワード
主題Scheme Other
主題 Fermi surface
キーワード
主題Scheme Other
主題 Antiferromagnetism
キーワード
主題Scheme Other
主題 NaxCoO2
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Yamakawa, Y.

× Yamakawa, Y.

WEKO 6819

Yamakawa, Y.

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Ono, Y.

× Ono, Y.

WEKO 62

Ono, Y.

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抄録
内容記述タイプ Abstract
内容記述 The electronic state in a CoO2 plane of the layered cobalt oxides NaxCoO2 is investigated by using the 11 band d–p model on a two-dimensional triangular lattice, where the tight-binding parameters are determined so as to fit the LDA band structure. Effects of the Coulomb interaction at a Co site: the intra- and inter-orbital direct terms U and U', the exchange coupling J and the pair-transfer J', are treated within the Hartree–Fock approximation. We also consider the effect of the Na order at x = 0.5, where Na ions form one-dimensional chains, by taking into account an effective one-dimensional potential Δεd on the CoO2 plane. It is found that the Na order enhances the Fermi surface nesting, resulting in the antiferromagnetism (AFM) which is suppressed due to the frustration effect in the case without the Na order. When U and Δεd are varied, we observe three types of AFM: (1) metallic AFM with large density of states NF at the Fermi level for small values of U and Δεd, (2) the semimetallic AFM with tiny NF for large U with small Δεd, and (3) the insulating AFM with a finite energy gap for large values of U and Δεd.
書誌情報 Journal of Physics: Condensed Matter
en : Journal of Physics: Condensed Matter

巻 19, 号 14, p. 145289-1-145289-5, 発行日 2007-03
出版者
出版者 IOP Publishing
ISSN
収録物識別子タイプ ISSN
収録物識別子 09538984
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA10672168
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1088/0953-8984/19/14/145289
著者版フラグ
値 author
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