| Project/Area Number |
26289092
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Saga University |
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Principal Investigator |
Zheng Xu-Guang 佐賀大学, 工学(系)研究科(研究院), 教授 (40236063)
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| Co-Investigator(Kenkyū-buntansha) |
真木 一 佐賀大学, 工学(系)研究科(研究院), 准教授 (10359945)
山内 一宏 佐賀大学, 工学(系)研究科(研究院), 特任助教 (60444395)
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| Research Collaborator |
MENG Dong-Dong
XU Xing-Liang
YAMAGUCHI Satoshi
OFUJI Ayumi
OKA Yuki
NAKANIWA Shou
YANASE Takuya
NUMANO Takeshi
YUASA Takahiro
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2014: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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| Keywords | 水素原子量子効果 / 強誘電性 / 水酸塩化物 / マルチフェロ / 強誘電体 / 量子原子効果 / 幾何学的フラストレーション / 水素秩序 / 電子・電気材料 / 誘電体物性 / 量子エレクトロニクス / 新奇強誘電性 / 同位体効果 / 電気磁気材料 |
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| Outline of Final Research Achievements |
Hydroxyl salts M2(OH)3X, where M represents a d-electron magnetic ion such as Cu, Co, Ni, Mn, or Fe and X represents the halogen ions Cl, Br, or I have been known for a long time. In recent years, these hydroxyl salts have attracted attention because our finding of their geometrically frustrated magnetism. Our latest finding was the ferroelectric-like responses in the deuterated hydroxyl salts with the highest crystal symmetry, i.e., rhombohedral Co2(OD)3Cl and Co2(OD)3Br, at temperatures of 220-230 K through an isotope effect, showing phenomenological similarity to proton type ferroelectricity.This research involved an extensive study of hydroxyl salts utilizing muon-spin-relaxation (muSR), NMR, Raman spectroscopy and neutron diffraction, supplemented by dielectric constant, magnetic susceptibility and heat capacity measurements, and has revealed a unique multiferroic system with deuterium-order-type ferroelectricity correlated to the geometrically frustrated magnetism.
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