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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

Antiferromagnetic, Charge and Orbital Ordered States of Na0.5CoO2 Based on the Two-Dimensional Triangular Lattice d-p Model

http://hdl.handle.net/10191/26878
http://hdl.handle.net/10191/26878
d5c5378f-9203-4ed5-a406-204e89df75ad
名前 / ファイル ライセンス アクション
994.pdf 994.pdf (522.7 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 Antiferromagnetic, Charge and Orbital Ordered States of Na0.5CoO2 Based on the Two-Dimensional Triangular Lattice d-p Model
タイトル
言語 en
タイトル Antiferromagnetic, Charge and Orbital Ordered States of Na0.5CoO2 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 cobalt oxides
キーワード
主題Scheme Other
主題 Fermi surface
キーワード
主題Scheme Other
主題 magnetic structure
キーワード
主題Scheme Other
主題 charge order
キーワード
主題Scheme Other
主題 orbital order
キーワード
主題Scheme Other
主題 metal-insulator transitions
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Yamakawa, Youichi

× Yamakawa, Youichi

WEKO 6809

Yamakawa, Youichi

Search repository
Ono, Yoshiaki

× Ono, Yoshiaki

WEKO 62

Ono, Yoshiaki

Search repository
抄録
内容記述タイプ Abstract
内容記述 We investigate the electronic state of a CoO2 plane in the layered cobalt oxides NaxCoO2 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 of an effective one-dimensional potential ΔEd. It is found that the one-dimensional Na order enhances the Fermi surface nesting and antiferromagnetism is caused which is suppressed due to the frustration effect in the case without the Na order. Furthermore, we consider the effect of the Coulomb interaction between the nearest-neighbor Co sites V and find that a coexistence of the magnetic, charge and orbital ordered state takes place for V > Vc where the system becomes insulator.
書誌情報 Journal of Physics and Chemistry of Solids
en : Journal of Physics and Chemistry of Solids

巻 69, 号 12, p. 3349-3351, 発行日 2008-12
出版者
出版者 Elsevier
ISSN
収録物識別子タイプ ISSN
収録物識別子 00223697
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA00704949
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1016/j.jpcs.2008.06.128
著者版フラグ
値 author
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