| Project/Area Number |
25400391
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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 |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Miyashita Seiji 東京大学, 大学院理学系研究科(理学部), 教授 (10143372)
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| Co-Investigator(Kenkyū-buntansha) |
森 貴司 東京大学, 大学院理学系研究科(理学部), 助教 (00647761)
西野 正理 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主幹研究員 (80391217)
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| Research Collaborator |
ENACHESCU Cristian Faculty of Physics-“Alexandru Ioan Cuza"University, Associate professor
ARNE RIKVOLD Per Florida State University, Department of Physics, Distinguished Research Professor and the James G. Skofronick Professor of Physics.
BOUKHEDDADEN Kamel University of Versailles Saint-Quentin, Professor
COLLET Eric University of Rennesl, Professor
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 相転移 / スピンクロスオーバー系 / 弾性相互作用 / 長距離力 / 準安定状態 / スピンクロスオーバー / フラストーション / 長距離相互作用 / 反強磁性体相互作用 / 秩序形成 |
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| Outline of Final Research Achievements |
We have studied the effect of elastic interaction on the phase transitions of spin-crossover systems. The effect causes an effective long-range interaction among the spin states. In particular, when the short-range interaction is antiferromagnetic, we discovered a peculiar phase structure due to the metastable state of ferromagnetic phase. We also studied cases of frustrated lattices, e.g., the antiferromagnets on the triangular lattice. There we found new types of order states, and also an anomalous size-dependence of metastable state. Moreover, we studied the dynamics after photo-irradiation which converts the low-spin state to high-spin state, and found the so-called elastic expansion which appears before the expansion due to the thermal effect. We have also studied several related topics on the cooperative phenomena.
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