Anomalous thermoelectric effect derived from strongly correlated electrons
| Project/Area Number |
25420723
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点・強相関物質グループ, グループリーダー (10354309)
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| Co-Investigator(Kenkyū-buntansha) |
新井 正男 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点・材料特性理論グループ, 主席研究員 (40222723)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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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 / 遷移金属化合物 |
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| Outline of Final Research Achievements |
We have studied thermoelectric properties and electronic structure of the novel cobalt oxide Ca1-xNaxCo2O4 (0<= x <= 0.6). The Na-substituted phases with x = 0.5 ~ 0.6 exhibit metallic behavior of transport properties with large thermoelectric power comparable to those in layered cobalt oxides. We found that the Ca1-xNaxCo2O4 metallic phases have 1-dimensional-like large Fermi surfaces on the Gamma-Y direction in the momentum space. Wilson ratio is estimated to be 2 ~ 3, which is moderately strong electronic correlation. Origin of the large thermoelectric power is discussed from the viewpoint of the band structure and the electronic correlation in the 3d electron system.
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Report
(5 results)
Research Products
(30 results)
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[Journal Article] The electronic structure of the high-symmetry perovskite iridate Ba2IrO42014
Author(s)
S. Moser, L. Moreschini, A. Ebrahimi, B. Dalla Piazza, M. Isobe, H. Okabe, J. Akimitsu, V. V. Mazurenko, K. S. Kim, A. Bostwick, E. Rotenberg, J. Chang, H. M. Rønnow, M. Grioni
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Journal Title
New J. Phys.
Volume: 16
Issue: 1
Pages: 13008-1
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Orbital occupancies and the putative jeff = 1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study2014
Author(s)
M. Moretti Sala, M. Rossi, S. Boseggia, J. Akimitsu, N. B. Brookes, M. Isobe, M. Minola, H. Okabe, H. M. Rønnow, L. Simonelli, D. F. McMorrow, and G. Monaco
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Journal Title
Phys. Rev. B
Volume: 89
Issue: 12
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Spin-Orbit-Coupling-Induced jeff States in Perovskite Iridates Studied by Photoemission Spectroscopy2014
Author(s)
A. YAMASAKI, O. KIRILMAZ, A. IRIZAWA, A. HIGASHIYA, T. MURO, H. FUJIWARA, F. PFAFF, P. SCHEIDERER, J. GABEL, M. SING, M. YABASHI, K. TAMASAKU, A. HLOSKOVSKYY, H. OKABE, H. YOSHIDA, M. ISOBE, J. AKIMITSU, W. DRUBE, T. ISHIKAWA, S. IMADA, A. SEKIYAMA, R. CLAESSEN, S. SUGA
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Journal Title
JPS Conf. Proc.
Volume: 3
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] Magnetic properties of carrier-doped Ba2IrO4 probed by mSR2013
Author(s)
H. Okabe, M. Isobe, E. Takayama-Muromachi, A. Koda, M. Hiraishi, M. Miyazaki, Y. Kadono, Y. Miyake, and J. Akimitsu
Organizer
The Internal Conference on Strongly Correlated Electron Systems (SCES2013)
Place of Presentation
Ito International Research Center Conference, The University of ,Tokyo, Japan
Related Report
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