| Project/Area Number |
17340100
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Japan Atomic Energy Institute |
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Principal Investigator |
SAKAI Toru Japan Atomic Energy Institute, Japan Atomic Energy Agency, Principal Scientist (60235116)
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| Co-Investigator(Kenkyū-buntansha) |
OKUNISHI Kouichi Niigata University, 理学部, Assistant Professor (30332646)
OKAMOTO Kiyomi 東京工業大学, Tokyo Institute of Technology, Assistant Professor (40152342)
SATO Masahiro Japan Atomic Energy Agency, 量子ビーム応用研究部門, Researcher (90425570)
OTSUKA Yuichi Japan Atomic Energy Agency, 量子ビーム応用研究部門, Researcher (30390652)
TONEGAWA Takashi Fukui University of Technology, 工学部, Professor (80028167)
野村 拓司 独立行政法人日本原子力研究開発機構, 研究職 (90373240)
松本 宗久 東北大学, 大学院・理学研究科, 助手 (30374888)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥6,750,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | spin nanotube / spin gap / quantum phase transition / low-dimensional systems / nanomagnets |
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| Research Abstract |
As a starting point, we theoretically investigated the three-leg spin nanotube, which is the sinplest one. At first we studied the properties of the spin gap for the model in which the unit cell is a regular triangle, using the numerical exact diagonalization and the density matrix renormalization group (DMRG) method with the finite-size scaling. As a result, we found that the spin gap exists when the interchain interaction is antiferromagnetic, while gapless for ferromagnetic interaction. We also investigated some field-induced phenomena of the three-leg spin nanotube. Using the perturbation approximation about the saturation magnetization, we found that two new phases ; the field-induced chiral ordered phase and the inhomogeneous magnetization phase in the so-called Tomonaga-Luttinger liquid state.
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