Large thermoelectric power in low-dimensional transition-metal oxides
| Project/Area Number |
22560676
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
ISOBE Masaaki 独立行政法人物質・材料研究機構, 超伝導物性ユニット, グループリーダー (10354309)
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Masao 独立行政法人物質・材料研究機構, 理論計算科学ユニット, 主幹研究員 (40222723)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 熱電材料 / 遷移金属酸化物 / 強相関電子系 / 磁性 / 計算物理 |
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| Research Abstract |
We have studied structural and physical properties of the novel 1-dimensional cobalt-oxide system Ca1-xNaxCo2O4. It was found that the heavily Na-substituted phases with x = 0.4 - 0.6 can exhibit metallic conductivity and unusually large thermoelectric power which is comparable to that in a layered cobalt oxide Ca3Co4O9. A possible mechanism of the large thermoelectric power is discussed from the viewpoint of the band structure and the strong electronic correlation in the 3d electron system.
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Report
(4 results)
Research Products
(68 results)
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[Journal Article] Ba_2IrO_4: A spin-orbit Mott insulating quasi-two-dimensional antiferromagnet2011
Author(s)
H. Okabe, M. Isobe, E. Takayama-Muromachi, A. Koda, S. Takeshita, M. Hiraishi, M. Miyazaki, R. Kadono, Y. Miyake, and J. Akimitsu
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Journal Title
Phys. Rev, B
Volume: 83
Pages: 1-8
Related Report
Peer Reviewed
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[Presentation] Spin-Orbit Mott State in the Novel Quasi-2D Iridate Ba_2IrO_42011
Author(s)
M. Isobe, H. Okabe, E. Takayama-Muromachi, A. Koda, S. Takeshita, M. Hiraishi, M. Miyazaki, R. Kadono, Y. Miyake, and J. Akimitsu
Organizer
International Conference on Strongly Correlated Electron Systems 2011
Place of Presentation
Cambridge, England
Related Report
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[Presentation] Spin-Orbit Mott State in the Novel Quasi-2D Antiferromagnet Ba_2IrO_42011
Author(s)
M. Isobe, H. Okabe, E. Takayama-Muromachi, A. Koda, S. Takeshita, M. Hiraishi, M. Miyazaki, R. Kadono, Y. Miyake, and J. Akimitsu
Organizer
26th International Conference on Low Temperature Physics (LT26)
Place of Presentation
Beijing, China
Related Report
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[Presentation] Magnetic ordering in spin-orbit Mott insulator Ba_2IrO_4 probed by μSR2011
Author(s)
H.Okabe, M.Isobe, E.Takayama-Muromachi, A.Koda, S.Takeshita, M.Hiraishi, M.Miyazaki, R.Kadono, Y.Miyake, J.Akimitsu
Organizer
26th International Conference on Low Temperature Physics (LT26)
Place of Presentation
Beijing, China
Related Report
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[Presentation] Transport properties of Na-substituted CaCo_2O_42010
Author(s)
Masaaki Isobe, Hiroyuki Yoshida, Makoto Tachibana, Tetsuya Kawashima, Masao Arai, Eiji Takayama-Muromachi, Akinori Irizawa
Organizer
International Conference on Thermoelectrics (ICT2010)
Place of Presentation
Renaissance Shanghai Zhongshan Park Hotel, Shanghai (China)
Related Report
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[Presentation] Transport properties of Na-substituted CaCo_2O_42010
Author(s)
Masaaki Isobe, Hiroyuki Yoshida, Makoto Tachibana, Tetsuya Kawashima, Masao Arai, Eiji Takayama-Muromachi, Akinori Irizawa
Organizer
International Conference on Thermoelectrics (ICT2010)
Place of Presentation
Renaissance Shanghai Zhongshan Park Hotel, Shanghai,(中国)
Related Report
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