| Project/Area Number |
24740232
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 強相関電子系 / 軌道自由度 / 分子性導体 / ルテニウム酸化物 / 銅酸化物高温超伝導体 / 電荷密度波 / くりこみ群 / 多軌道系 / 電荷秩序 / 繰り込み群 / 物性理論 |
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| Outline of Final Research Achievements |
We performed theoretical analysis of the novel phenomena induced by the orbital degrees of freedom in molecular conductors, ruthenate superconductors, and high-Tc cuprate superconductors. We developed a new scheme of the renormalization-group method, called the RG+cRPA method, which enables us to calculate higher-order vertex corrections systematically with high numerical accuracy. By utilizing this method, we revealed the origin of intramolecular charge ordering in molecular conductors, and proposed a new mechanism of the triplet superconductivity in ruthenates. For the cuprates, we predicted that the orbital degree of freedom is of crucial importance, and succeeded for the first time in reproducing the experimentally-observed charge-density-wave state.
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