Study of metal-insulator transition in the 5d transition metal pyrochlore oxide Cd2Os2O7
| 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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Report
(4 results)
Research Products
(31 results)
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[Journal Article] Understanding of the Temperature–Pressure Phase Diagram of β-Pyrochlore Oxides: A Role of Anhamonicity on Superconductivity2013
Author(s)
T. Isono, D. Iguchi, T. Matsubara, Y. Machida, B. Salce, J. Flouquet, H. Ogusu, J. Yamaura, Z. Hiroi, K. Izawa
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Journal Title
J. Phys. Soc. Jpn.
Volume: 82
Issue: 11
Pages: 114708-114708
DOI
ISSN
0031-9015, 1347-4073
Related Report
Peer Reviewed
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[Journal Article] Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd_2Os_2O_72012
Author(s)
J. Yamaura, K. Ohgushi, H. Ohsumi, T. Hasegawa, I. Yamauchi, K. Sugimoto, S. Takeshita, A. Tokuda, M. Takata, M. Udagawa, M. Takigawa, H. Harima, T. Arima, and Z. Hiroi
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Journal Title
Physical Review Letters
Volume: 108
Pages: 247205-247205
DOI
Related Report
Peer Reviewed
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