| Project/Area Number |
22740234
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
|
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 中性子散乱 / 磁性 / 量子スピン / 量子現象 / フラストレーション系 / 量子スピン系 / スピンネマティック状態 |
|---|
| Research Abstract |
Spin dynamics of the square lattice Heisenberg antiferromagnet, Ba_2MnGe_2O_7, is studied by a combination of bulk measurements, neutron diffraction, and inelastic neutron-scattering techniques. Easy plane type antiferromagnetic order is identified at T=4. 0 K. The exchange interactions are estimated as J_1=27μeV and J_2=1. 0μeV, and the saturation field H_c is 9. 75 T. Magnetic excitation measurements with high experimental resolution setup by triple axis neutron spectrometer reveals the instability of one magnon excitation in the field range of 0. 7H_c<H<0. 85H_c.
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