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Effects of short-range correlations on the Coulomb screening and the pairing interactions in electron-phonon systems - triplet pairing mediated by phonons -
https://hiroshima.repo.nii.ac.jp/records/2011757
https://hiroshima.repo.nii.ac.jp/records/20117574b4e419d-751a-4d62-b7a9-50dead230c3a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
shimahara_0403628.pdf (463.3 KB)
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| Item type | デフォルトアイテムタイプ_（フル）(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-18 | |||||||
| タイトル | ||||||||
| タイトル | Effects of short-range correlations on the Coulomb screening and the pairing interactions in electron-phonon systems - triplet pairing mediated by phonons - | |||||||
| 言語 | en | |||||||
| 作成者 |
Shimahara, Hiroshi
× Shimahara, Hiroshi
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| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | phonon-mediated pairing interactions | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Coulomb screening | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | electron-phonon system | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | overscreening | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | spin and charge fluctuations | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | exotic superconductors | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | spin-triplet pairing | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | heavy fermion superconductors | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | organic superconductors | |||||||
| 主題 | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | ruthenate superconductors | |||||||
| 主題 | ||||||||
| 主題Scheme | NDC | |||||||
| 主題 | 420 | |||||||
| 内容記述 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Effects of short-range correlations on the Coulomb screening, the phonons, and the pairing interactions are examined in electron-phonon systems. First, we derive a model Hamiltonian of Coulomb interactions which includes both the long-range part vq and the short-range part U. It is found from the expression of the dielectric function that the strong on-site correlations weaken the Coulomb screening. Secondly, we examine the screened phonons and the interaction mediated by phonons. In a consistent picture, wed erive an expression of the effective interaction which includes (1) the screened Coulomb interactions, (2) the pairing interactions mediated by phonons, and (3) the effective interactions mediated by spin and charge fluctuations. It is rewritten in a form of a summation of (a) the effective interactions of the pure Hubbard model without the long-range Coulomb interactions, and (b) the phonon-mediated interactions plus screened Coulomb interactions with corrections due to both Uandvq. Thirdly, we derive an effective Hamiltonian an alogous to the BCS Hamiltonian. Fourthly, for some typical values of parameters, we obtain the ground state phase diagrams. It is found that spin-triplet superconductivity mediated by phonons occurs when the short-range electron correlations are sufficiently strong, and the Coulomb screening is sufficiently weak. We estimatet he orders of the transition temperatures when thet riplet superconductivity occurs. The obtained values are realistic for existing candidates of the triplet superconductors as the order of the magnitudes. The possible relevance of the phonon-mediated interactions to the heavy fermion superconductor UPt3 and the layered superconductors such (TMTSF)2X and Sr2RuO4 are briefly discussed. | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_1843 | |||||||
| 資源タイプ | other | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | AO | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_b1a7d7d4d402bcce | |||||||
| 関連情報 | ||||||||
| 関連タイプ | isVersionOf | |||||||
| 識別子タイプ | arXiv | |||||||
| 関連識別子 | arXiv:cond-mat/0403628 | |||||||
| 書誌情報 |
発行日 2004-03 |
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| 旧ID | 14220 | |||||||
