Synthesis of novel magnetic ferroelectrics under high pressure with the use of ion exchange and hydrothermal reactions

利用离子交换和水热反应在高压下合成新型磁性铁电体

• 批准号: 21750069
• 负责人: ISHIWATA Shintaro
• 金额: $ 3万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21750069/
• 关键词: マルチフェロイックス; ペロブスカイト型マンガン酸化物; 高圧合成; 電気磁気効果; 放射光X線回折; 強相関電子系; 単結晶構造解析; フラストレーション; 対称性交換歪み

We have succeeded in obtaining high-quality polycrystalline samples of perovskite Eu_<1-x>Y_xMnO_3 and Y_<1-x>Y_xMnO_3 by a high pressure technique with using single crystalline precursors of the ambient pressure phase. Complete multiferroic phase diagram of orthorhombic RMnO_3 was established. Furthermore, we have found that the magnetoelectric response is enhanced near the bicritical phase boundary. Single crystals of perovskite YMnO_3 were successfully grown under high pressure with a quasi hydrothermal condition. By using a synchrotron x-ray, we have observed for the first time ferroelectric lattice displacement driven by a magnetic order in YMnO_3.

我们利用常压相单晶前驱体的高压技术，成功地获得了高质量的钙钛矿Eu_x；1-x&gt；Y_xMnO_3和Y_xMnO_3多晶样品。建立了斜方相RMnO_3的完整多铁相图。此外，我们还发现，在双临界相界附近，磁电响应增强。在高压、准水热条件下成功地生长了钙钛矿型YMnO_3单晶。用同步辐射x射线首次观测到了YMnO_3中磁序驱动的铁电晶格位移。

项目成果

中性子非弾性散乱によるBa_2Mg_2Fe_<12>O_<22>のマグノンの観測

Ba_2Mg_2Fe_<12>O_<22>中磁振子的非弹性中子散射观测

• 发表时间: 2009
• 作者: 岩佐和晃;他6名
• 通讯作者: 他6名

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Uniaxial colossal magnetoresistance in the Ising magnet SrCo12O19

Ising 磁体 SrCo12O19 中的单轴巨磁阻

• 发表时间: 2011
• 期刊: Phys.Rev.B
• 作者: H.W.Kim、J.Jung、M.Han、S.Lim、K.Tamada、M.Hara、M.Kawai、Y.Kim;Y.Kuk;S.Ishiwata
• 通讯作者: S.Ishiwata