| Project/Area Number |
24740223
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
NAMBU Yusuke 東北大学, 多元物質科学研究所, 助教 (60579803)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | フラストレート磁性体 / 中性子散乱 / 三角格子反強磁性体 / 籠目格子反強磁性体 / 巨視的量子状態 |
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| Research Abstract |
Geometrical frustration has attracted a lot of interest because of a potential emergence of novel quantum states. To elucidate spin-dependent macroscopic quantum states, neutron scattering measurements were performed on frustrated magnets. In triangular antiferromagnets with spin-1 and 2, inelastic and polarized elastic neutron scattering measurements reveal the possible existence of magnetic quadrupole interactions. Indeed, our experimental findings cannot be explained by simple spin-spin exchange interactions. In addition, we have applied inelastic neutron scattering on spin-1/2 Kagome antiferromagnets. Through detailed study of magnetic excitations, singlet-triplet excitations and its magnetic field evolution, and renormalization of excitation energy predicted by the linear spin wave theory due to quantum effects are clarified.
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