| Project/Area Number |
26400369
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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 University of Science |
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Principal Investigator |
Mitsuda Setsuo 東京理科大学, 理学部第一部物理学科, 教授 (90183962)
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| Co-Investigator(Renkei-kenkyūsha) |
KITAZAWA HIDEAKI 物質・材料研究機構, 先端材料解析研究拠点, 副拠点長 (00195257)
NAKAJIMA TARO 理化学研究所, 創発物性科学研究センター, 研究員 (30579785)
TERADA NORIKI 物質・材料研究機構, 量子ビームユニット, 主任研究員 (60442993)
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| Research Collaborator |
Karel Prokes Helmholtz-Zentrum Berlin für Materialien und Energie, Department Materials for Green Spintronics
Klaus Kiefer Helmholtz-Zentrum Berlin für Materialien und Energie, Department Sample Environment
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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 |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | スピン格子複合系 / スピンフラストレーション / マルチフェロイック / 交差相関物性 / 一軸応力 / 二等辺三角格子反強磁性 / スピン格子複合形 / スピン・格子系 |
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| Outline of Final Research Achievements |
(i) We have found that the application of uniaxial pressure p up to 600 MPa induces a new ferroelectric phase in a multiferroic CuFe1-xGaxO2, which is different from the well-studied spin-driven ferroelectric phase with helical magnetic ordering. The magnetic structure in the p-induced ferroelectric phase seems to be of a collinear sinusoidal type. Although this magnetic structure itself does not break the inversion symmetry, it is considered to play an important role in the origin of ferroelectricity in the p-induced ferroelectric phase through the spin-lattice coupling in this system. (ii) For an Ising magnet CoNb2O6, we succeeded in crossing the Wannier point (γ = 1) and access the region of γ < 1 by applying uniaxial pressure up to 1GPa along the c axis, where magnetic ground state AF-II magnetic ordering with q=1/ 2 is switched to AF-I magnetic ordering with q=0 at this critical uniaxial pressure~700MPa.
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