2011 Fiscal Year Final Research Report
Study of electron-doped manganite single crystals using high-pressure synthesis methods
| Project/Area Number |
22740244
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
SAKAI Hideaki 独立行政法人理化学研究所, 交差相関物質研究チーム, 客員研究員 (20534598)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 強相関電子系 / マンガン酸化物 / 高圧合成法 / 磁性半導体 / マルチフェロイック / 軌道秩序 / 強誘電転移 / ソフトフォノン |
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| Research Abstract |
So far, there have been few studies on "electron-doped" manganites, the Mn valence of which is close to 4+. By using high-pressure synthesis methods, recently, we succeeded in synthesizing the single crystals of SrMnO_3, which is a parent compound with Mn^<4+> ions. In this project, by controlling the carrier number and/or lattice constant with partial substitution of Sr ions, we have revealed the overall features of electronic and lattice states for the electron-doped manganites. In particular, we have found a novel insulator-metal transition accompanied by a magnetic transition, which is controllable with 1% carrier doping. Furthermore, we have discovered a ferroelectric transition with off-center Mn^<4+> ions by substituting Sr ions with Ba ions. The ferroelectric properties are much nicer than those for the conventional multiferroic materials. These materials would be quite promising for future spintronic technology.
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Research Products
(19 results)
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[Journal Article] Emergent phenomena in perovskite-type manganites2012
Author(s)
Taguchi Y, Sakai H, Okuyama D, Ishiwata S, Fujioka J, Fukuda T, Hashizume D, Kagawa F, Takahashi Y, Shimano R, Tokunaga Y, Kaneko Y, Nakao A, Nakao H, Murakami Y, Sugimoto K, Takata M, Yamauchi K, Picozzi S, Baron A. Q. R, Arima T, and Tokura Y
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Journal Title
Physica B
Volume: vol.407
Pages: 1685-1688
Peer Reviewed
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[Journal Article] Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO_32011
Author(s)
Okuyama D, Ishiwata S, Takahashi Y, Yamauchi S, Picozzi S, Sugimoto K, Sakai H, Takata M, Shimano R, Taguchi Y, Arima T, and Tokura Y
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Journal Title
Phys. Rev. B
Volume: vol.84
Pages: 054440
Peer Reviewed
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[Journal Article] Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr_<1-x> Ba_xMnO_32011
Author(s)
Sakai H, Fujioka J, Fukuda T, Okuyama D, Hashizume D, Kagawa F, Nakao H, Murakami Y, Arima T, Baron A. Q. R, Taguchi Y, and Tokura Y
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Journal Title
Phys. Rev. Lett
Volume: vol.107
Pages: 137601
Peer Reviewed
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