| Project/Area Number |
04452046
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | WASEDA UNIVERSITY |
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Principal Investigator |
KOHN Kay WASEDA UNIVERSITY,SCHOOL OF SCIENCE AND ENGINEERING,DEPARTMENT OF PHYSICS,PROFESSOR, 理工学部, 教授 (40063656)
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| Co-Investigator(Kenkyū-buntansha) |
IKEDA Naoshi WASEDA UNIVERSITY,SCHOOL OF SCIENCE AND ENGINEERING,DEPARTMENT OF PHYSICS,INSTRU, 理工学部, 講師 (00222894)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | magnetic transition / helimagnetic ordering / ferroelectric transition / structural transition in solids / magnetoelectric effect / rare earth manganese oxide / EuMn_2O_5 / GdMn_2O_5 / TbMn_2O_5 / DyMn_2O_5 / HoMn_2O_5 / ErMn_2O_5 / TmMn_2O_5 / YbMn_2O_5 / YMn_2O_5 / BiMn_2O_5 / DyMn_2O_5 / 反強磁性強誘電体 |
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| Research Abstract |
We performed dielectric, magnetic, and magnetoelectric studies of a series of manganites with a formula of RMn_2O_5, where R is a rare earth between Eu and Yb, Y or Bi. In addition to the development of helimagnetic ordering of Mn spins and that of rare earth spins at lower temperature, we obtained the evidences of successive structural transitions, where these crystals tuned into ferroelectric. The origin of the spontaneous polarization was considered to be the displacements of three different kind of metallic ions Mn^3+'s, Mn^<4+>'s and R^<3+>'s. The lower magnetic transition, where the spins of R^<3+> order is generally accompanied with a structural transition with a large change in spontaneous transition.
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