| Project/Area Number |
24540360
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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 | Tokyo Institute of Technology |
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Principal Investigator |
YAMAURA Jun-ichi 東京工業大学, 元素戦略研究センター, 特任准教授 (80292762)
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| Co-Investigator(Renkei-kenkyūsha) |
廣井 善二 (筒井 智嗣) 東京大学, 物性研究所, 教授 (30192719)
長谷川 巧 広島大学, 総合科学研究科, 助教 (20508171)
堀場 律子 岡山大学, 自然科学研究科, 助教 (50415098)
大串 研也 東北大学, 理学部, 教授 (30455331)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 金属絶縁体転移 / 反強磁性転移 / 磁気構造 / 共鳴X線散乱 / リフシッツ転移 / 磁気転移 / フラストレーション / パイロクロア / 国際情報交換(フランス) |
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| Outline of Final Research Achievements |
5d-transition metal pyrochlore oxide Cd2Os2O7 shows a metal-insulator transition at 227 K with magnetic ordering. The pyrochlore lattice is composed of the corner-shared tetrahedral Os network, in which the Os atoms have functions as the electric conduction and/or the magnetic moment. Since a geometrical frustration between localized spins prevents a long-range magnetic ordering, a peculiar magnetic structure is expected in the ordered state. We observed a commensurate magnetic peak of q = (0, 0, 0) by resonant x-ray scattering in a high-quality single crystal. We propose a noncollinear all-in/all-out spin arrangement on the pyrochlore lattice of Os atoms, in which all the spins point to (all-in) or away (all-out) from the centers of the tetrahedron. The magnetostriction, magnetocapacitance, Voigt magnetooptic effect, and magnetic susceptibility are expected to have a term linear to the external magnetic field.
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