| Project/Area Number |
23540390
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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 | Shizuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KOGA Mikito 静岡大学, 教育学部, 教授 (40324321)
KUSUNOSE Hiroaki 愛媛大学, 理工学研究科, 准教授 (00292201)
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| Co-Investigator(Renkei-kenkyūsha) |
SEKINE Tomoyuki 上智大学, 理工学部, 教授 (60110722)
KUROE Haruhiko 上智大学, 理工学部, 准教授 (40296885)
KIMURA Shojiro 東北大学, 金属材料研究所, 准教授 (20379316)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 磁性 / 量子スピン系 / 多極子 / マルチフェロイクス / 四極子 / スピンネマティック / 量子相転移 / 振幅モード / 複合スピン系 / スピン三量体 / 拡張スピン波理論 / 中性子散乱 / 三重量子ドット / スピン電荷制御 / magnetic excitation / spin dimer / monomer / spin-wave theory / multiferroics |
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| Research Abstract |
We proposed a theory for complicated quantum spin systems in which plural spins interact with each other strongly. The strongly interacting part can be regarded as a multispin unit and we introduced a form factor that depends on magnetic structure of the multispin unit. We applied the theory to a particular materials and investigated intensity of inelastic neutron scattering. When the magnetic ion is located at a site without inversion symmetry, quadrupole operator becomes equivalent to the electric polarization. This results in maltiferroic properties. In a particular material, there are intersite quadrupole interactions. We reported that they can determine the easy axis.
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