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Structural transition, ferro-orbital order and its fluctuation-mediated s++-wave superconductivity in iron pnictides
http://hdl.handle.net/10191/26914
http://hdl.handle.net/10191/26914da8751f3-2ea6-49df-9c5e-f8ba1b1dad08
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
975.pdf (1.0 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-04-17 | |||||
| タイトル | ||||||
| タイトル | Structural transition, ferro-orbital order and its fluctuation-mediated s++-wave superconductivity in iron pnictides | |||||
| タイトル | ||||||
| タイトル | Structural transition, ferro-orbital order and its fluctuation-mediated s++-wave superconductivity in iron pnictides | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | A. Superconductors | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | D. Electron–electron interactions | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | D. Electron–phonon interactions | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | D. Phase transitions | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Ono, Yoshiaki
× Ono, Yoshiaki× Yanagi, Yuki× Adachi, Naoko× Yamakawa, Youichi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We investigate the electronic states and the superconductivity in the two-dimensional 16-band d–p model extracted from a tight-binding fit to the band structure of iron pnictides, in the presence of both the Coulomb interaction between Fe d-electrons and the electron–lattice coupling g with the orthorhombic mode which is crucial for reproducing the recently observed ultrasonic softening of the elastic constant C66. Due to the cooperative effects of these interactions, the ferro-orbital order with different occupations of dyz and xdzx orbitals occurs and induces the tetragonal-orthorhombic structural transition at Ts, together with the stripe-type antiferromagnetic (AFM) order below TNTN. For a large gg case, we obtain the phase diagram consistent with the doped iron pnictides with Ts>TN for x>0, where the s++-wave superconductivity is mediated by the ferro-orbital fluctuation which is largely enhanced near the ferro-orbital QCP at Xc with Ts→0. On the other hand, for a small g case, the simultaneous phase transition occurs at Ts=TN even for x>0, where the s±-wave superconductivity is mediated by the AFM fluctuation. Both the s-wave states with full superconducting gaps are consistent with most of the experiments but only the former is considered to account for the small Tc-suppression against nonmagnetic impurities. | |||||
| 書誌情報 |
Solid State Communications en : Solid State Communications 巻 152, 号 8, p. 701-710, 発行日 2012-04 |
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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 | 00381098 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA00844573 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1016/j.ssc.2012.01.017 | |||||
| 著者版フラグ | ||||||
| 値 | author | |||||
