| Project/Area Number |
15K05189
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
Yamase Hiroyuki 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 (10342867)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 物性理論 / 高温超伝導 / 電子ネマチック / 軌道揺らぎ / スピン揺らぎ |
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| Outline of Final Research Achievements |
Orbital nematicity is a hot topic in iron-based superconductors and leads to the so-called nematic state in terms of orbital degrees of freedom. In this state, the system breaks only xy symmetry, keeping the other symmetries unbroken. In the present work, considering the realistic situation in iron-based superconductors, we study the pairing mechanism in the presence of both orbital nematic fluctuations and spin fluctuations. It turns out that both are competitive and high-Tc can be reached by orbital nematic fluctuations, because spin fluctuations are found to have the self-restraint effect of the superconducting instability. The pairing gap is almost isotropic on each Fermi surface and it becomes highly anisotropic on the hole Fermi surfaces when the superconducting instability occurs in the nematic phase.
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