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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/10191/26878d5c5378f-9203-4ed5-a406-204e89df75ad
名前 / ファイル | ライセンス | アクション |
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994.pdf (522.7 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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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× Ono, Yoshiaki |
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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 |
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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 |