| Project/Area Number |
26400336
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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 | Kyoto University (2015-2016)
Tokyo Metropolitan University (2014) |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Hiromi Otsuka 首都大学, 東京・理工学研究科, 助教 (10254145)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 磁性 / スピンアイス / 磁気モノポール / 量子スピン液体 / 量子スピンアイス / 四極子 / Tb2Ti2O7 / スピン液体 / 多極子 / Dy2Ti2O7 |
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| Outline of Final Research Achievements |
We have investigated monopole dynamics in the spin-ice compound Dy2Ti2O7, which is a topological point defect theoretically similar to the Dirac monopole interacting with magnetic Coulomb force. In particular, we have studied two dimensional monopole dynamics by using ac magnetic susceptibility experiments in an ac field perpendicular to dc. We demonstrated that the slowing down of monopole dynamics in a certain field (~0.4 T) and the extreme speeding up under dc field close to the critical point (~0.9 T). We also have investigated Tb2Ti2O7, which bears resemblance to Dy2Ti2O7, and found that it could be a quantum spin ice in the vicinity of a quadrupole order state, tuned by a precise composition ration of Tb/Ti.
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