Research for large thermoelectric responses of transition metal oxides by controlling nanostructure
| Project/Area Number |
25400378
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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 |
Condensed matter physics II
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| Research Institution | Kagoshima University |
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Principal Investigator |
Okuda Tetsuji 鹿児島大学, 理工学域工学系, 准教授 (20347082)
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| Co-Investigator(Kenkyū-buntansha) |
SAITOH Tomohiko 東京理科大学, 理学部, 教授 (30311129)
KAJIMOTO Ryoichi 独立行政法人日本原子力研究開発機構, その他部局等, 主任研究員 (30391254)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 熱電材料 / 遷移金属酸化物 / 熱電特性 / 酸化物半導体 / Jahn-Teller歪 / フラストレーション / 光電子分光 / 非弾性中性子散乱 / 電界ドーピング |
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| Outline of Final Research Achievements |
In this research, we have investigated a mechanism of enhancement of thermoelectric property in the electron-doped SrTiO3 by a substitution of Mn ions. By measurements of macroscopic properties such as thermoelectric property, Hall coefficient, magnetic property, and specific heat, and that of phonon excitations by an inelastic neutron scattering measurement, we have shown the possibility that the enhancement is caused by a nontrivial enhancement of low-energy phonon excitation and an enhancement of Seebeck coefficient due to some interaction between itinerant electrons and localized spins of Mn ions.
Furthermore, we have investigated a magnetic excitation of antiferromagnetic triangular lattice CuCrO2 which is one of candidates of p-type thermoelectric oxides by an inelastic neutron scattering measurement and have clarified electronic structures of hole-doped CuCrO2 and the related materials by photoemission spectroscopy.
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Report
(4 results)
Research Products
(42 results)
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[Journal Article] Electronic Phase Transition in Hollandite Titanate BaxTi8O16+x2015
Author(s)
R. Murata, T. Sato, T. Okuda, Y. Horibe, H. Tsukasaki, S. Mori, N. Yamaguchi, K. Sugimoto, S. Kawaguchi, M. Takata, and T. Katsufuji
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Journal Title
Physical Review B
Volume: 92
Issue: 22
DOI
Related Report
Peer Reviewed
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[Journal Article] Cu-O-Cr Hybridization Effects on the Electronic Structure of a Hole-Doped Delafossite Oxide CuCr1-xMgxO22014
Author(s)
M. Okawa, T. Yokobori, K. Konishi, R. Takei, K. Katayama, S. Oozono, T. Shinmura, T. Okuda, H. Wadati, E. Sakai, K. Ono, H. Kumigashira, M. Oshima, T. Sugiyama, E. Ikenaga, N. Hamada, and T. Saitoh
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Journal Title
JPS Conference Proceedings
Volume: 3
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Electronic structure of hole-doped delafossite oxides CuCr_1-_xMg_xO_22013
Author(s)
T. Yokobori, M. Okawa, K. Konishi, R. Takei, K. Katayama, S. Oozono, T. Shinmura, T. Okuda, H. Wadati, E. Sakai, K. Ono, H. Kumigashira, M. Oshima, T. Sugiyama, E. Ikenaga, N. Hamada, and T. Saitoh
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Journal Title
Phys. Rev. B
Volume: 87
Issue: 19
Pages: 195124-195124
DOI
Related Report
Peer Reviewed
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[Presentation] Cu1+xMn1-xO2（x=0, 0.05）の電子構造2016
Author(s)
加藤諒, 大川万里生, 和達大樹, 吉田鉄平, 小野寛太, 池永英司, 奥田哲治, 齋藤智彦
Organizer
第29回日本放射光学会年会・放射光科学合同シンポジウム
Place of Presentation
東京大学柏の葉キャンパス駅前サテライト・柏の葉カンファレンスセンター（三井ガーデンホテル柏の葉）・オークビレッジ柏の葉 （千葉県、柏市）
Year and Date
2016-01-09
Related Report
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[Presentation] Mn置換した電子ドープSrTiO3の低温比熱2015
Author(s)
奥田哲治, 江藤貴弘, 畑博人, 草原彰吾, 仁科康佑, 桑原英樹, 中村充孝, 梶本亮一
Organizer
日本物理学会 2015度秋季大会
Place of Presentation
関西大学 千里山キャンパス （大阪府、吹田市）
Year and Date
2015-09-25
Related Report
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[Presentation] デラフォサイト型酸化物CuMO2 (M=Al,Cr,Fe)との比較によるクレドネライト型酸化物CuMnO2の電子構造2015
Author(s)
加藤諒, 大川万里生, 和達大樹, 吉田鉄平, 小野寛太, 池永英司, 奥田哲治, 齋藤智彦
Organizer
日本物理学会
Place of Presentation
早稲田大学, 東京都新宿区
Year and Date
2015-03-21 – 2015-03-24
Related Report
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[Presentation] CuMO2 (M = Al,Cr,Mn,Fe)の電子構造2015
Author(s)
加藤諒, 大川万里生, 和達大樹, 吉田鉄平, 小野寛太, 池永英司, 奥田哲治, 斎藤智彦
Organizer
第28回日本放射光学会年会
Place of Presentation
立命館大学, 滋賀県草津市
Year and Date
2015-01-10 – 2015-01-12
Related Report
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[Presentation] CuCrO2の電子構造と磁気特性・輸送特性の関係2014
Author(s)
加藤 諒, 大川万里生, 和達大樹, 吉田徹平, Kozina Xeniya, 池永英司, 小野寛太, 奥田哲治, 齋藤智彦
Organizer
第７５回日本応用物理学会秋季学術講演会
Place of Presentation
北海道大学, 北海道札幌市
Year and Date
2014-09-17 – 2014-09-20
Related Report
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