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Metal-insulator Transition and Superconductivity in the Two-orbital Hubbard-Holstein Model for Iron-based Superconductors
http://hdl.handle.net/10191/47678
http://hdl.handle.net/10191/476781e4514b5-c941-42fb-b952-4f7e48908a97
名前 / ファイル | ライセンス | アクション |
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83_044711.pdf (801.1 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-07-18 | |||||
タイトル | ||||||
タイトル | Metal-insulator Transition and Superconductivity in the Two-orbital Hubbard-Holstein Model for Iron-based Superconductors | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Metal-insulator Transition and Superconductivity in the Two-orbital Hubbard-Holstein Model for Iron-based Superconductors | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | iron pnictide superconductor | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | multi-orbital system | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Jahn-Teller electron-phonon coupling | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | orbital fluctuation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | magnetic fluctuation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | dynamical mean-field theory | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Yamada, Takemi
× Yamada, Takemi× Ishizuka, Jun× Ono, Yoshiaki |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We investigate a two-orbital model for iron-based superconductors to elucidate the effect of interplay between electron correlation and Jahn-Teller electron-phonon coupling by using the dynamical mean-field theory combined with the exact diagonalization method. When the intra- and inter-orbital Coulomb interactions, U and U′, increase with U = U′, both the local spin and orbital susceptibilities, χ_s and χ_o, increase with χ_s = χ_o in the absence of the Hund’s rule coupling J and the electron-phonon coupling g. In the presence of J and g, there are distinct two regimes: for J >__~ 2g^2 /ω_0 with the phonon frequency ω_0, χ_s is enhanced relative to χ_o and shows a divergence at J = J_c above which the system becomes Mott insulator, while for J <__~ 2g^2/ω_0, χ_o is enhanced relative to χ_s and shows a divergence at g = g_c above which the system becomes bipolaronic insulator. In the former regime, the superconductivity is mediated by antiferromagnetic fluctuations enhanced due to Fermi-surface nesting and is found to be largely dependent on carrier doping. On the other hand, in the latter regime, the superconductivity is mediated by ferro-orbital fluctuations and is observed for wide doping region including heavily doped case without the Fermi-surface nesting. | |||||
書誌情報 |
Journal of the Physical Society of Japan en : Journal of the Physical Society of Japan 巻 83, 号 4, p. 044711-1-044711-8, 発行日 2014-03 |
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出版者 | ||||||
出版者 | The Physical Society of Japan | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00319015 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00704814 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.7566/JPSJ.83.044711 | |||||
権利 | ||||||
権利情報 | Copyright (C) 2014 The Physical Society of Japan | |||||
著者版フラグ | ||||||
値 | author | |||||
異版である | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | URI | |||||
関連識別子 | http://journals.jps.jp/doi/abs/10.7566/JPSJ.83.044711 |