| Project/Area Number |
17510089
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanostructural science
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| Research Institution | Saga University |
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Principal Investigator |
ZHENG Xu-Guang Saga University, Department of Physics, Professor, 理工学部, 教授 (40236063)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Quantumn fluctuation / geometric frustration / coexisting spin order and disorder / 幾何学的フラストレーション |
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| Research Abstract |
Main results:
1. We prepared nanoparticles of CuO and investigated the change in magnetism. We have found that the magnetic transition temperature in nanoparticle CuO is drastically reduced, demonstrating a dramatic finite-size effect. This is the first report of direct evidence of a drastic decrease of the magnetic transition temperature in antiferromagnetic system.
2. We have found a new magnetic material system of hydroxyhalides M_2(OH)_3X where M stands for magnetic ions and X for halogens. We found they are a new geometrically frustarated spin system with novel new quantumn spin properties. In special, we found the co-existence of spin fluctuation and magnetic order in structurally ordered magnets. This discovery uncovers a new route for the study of geometric frustration both in the material aspect as well as in the magnetism (of d-electron spins). As a material route, it provides a new system of M_2(OH)_3 X with a huge number where M is transition metal and X halogen.
These discoveries are partly reflected in 12 papers published in high-profile scientific magazines, two papers in Physical Review Letters and five papers in Physical Review B.
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