| Project/Area Number |
25620071
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Functional solid state chemistry
|
|---|
| Research Institution | Japan Atomic Energy Agency |
|---|
Principal Investigator |
Yoshii Kenji 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (90354985)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Tatsuo 岡山大学, 自然科学研究科, 教授 (80205468)
YONEDA Yasuhiro 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (30343924)
SAITOH Hiroyuki 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (20373243)
FUKUDA Tatsuo 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究副主幹 (80354984)
MATSUMURA Daiju 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究副主幹 (30425566)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
IKEDA Naoshi 岡山大学, 自然科学研究科, 教授 (00222894)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
|---|
| Keywords | マルチフェロイック / 電子強誘電体 / 量子揺らぎ / 超伝導 / 三角格子 / Resonating Valence Bond |
|---|
| Outline of Final Research Achievements |
We have searched for a superconducting phase in electronic ferroelectric multiferroic RFe2O4 (R: rare earths). Electrical resistivity measurements were performed under high pressures up to 4 GPa to increase the interactions between the Fe ions inside the Fe-O plane. Although the pressure was raised up to 4 GPa, the system remained semiconducting. However, a slight change was observed for YFe2O4 around 1-2 GPa; the activation energy was slightly decreased at higher pressures. Also, the elemental substitution at R site was attempted. We found that the magnetic transition temperature (250 K) was increased by 5-10 K by the substitution of the large R3+ ion (Dy3+). This result is interesting from the viewpoint of a search for room temperature multiferroic materials.
|
