Low-temperature thermoelectric response of insulators
Project/Area Number |
16K05435
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | Gakushuin University (2018) Tokyo Institute of Technology (2016-2017) |
Principal Investigator |
Machida Yo 学習院大学, 理学部, 准教授 (40514740)
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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Keywords | 熱電現象 / フォノン流体 / 熱電効果 / 2次元層状物質 / フォノン熱輸送 / 黒リン / 半導体 / 熱電係数 / 絶縁体 |
Outline of Final Research Achievements |
Seebeck coefficient measurements on two-dimensional layered material, black phosphorus in the wide temperature range reveal thermoelectric response in each transport regimes including the activating regime and hopping regime. Moreover, it was clarified that the Seebeck coefficient exhibits a power-law behavior at low temperature and vanishes as temperature does to zero. This result implies that two distinct contribution from hole and electron carriers to the Seebeck coefficient cancel out in extrinsic semiconductors. It was also found that the Seebeck coefficient shows a critical behavior characterized by an enhancement of the Seebeck coefficient divided by temperature in the vicinity of critical pressure of metal-insulator transition.
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Academic Significance and Societal Importance of the Research Achievements |
熱電効果は廃熱エネルギーを電気エネルギーに変換して有効に活用するための基盤技術である。現在、熱電材料として利用されている物質の多くは半導体である。本研究を通して得られた半導体・絶縁体のゼーベック係数に関する知見は、現状よりも更なる高効率の熱電変換材料の開発に役立てられるものと期待される。また本研究を通じて、絶縁体の低温極限におけるゼーベック係数の振る舞いや、金属絶縁体転移近傍における臨界的挙動が明らかされたことは、固体の熱電現象に関する根本的な理解を進める学術的意義をもつ。
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Report
(4 results)
Research Products
(14 results)
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[Journal Article] Anisotropic B-T Phase Diagram of Non-Kramers System PrRh2Zn202017
Author(s)
T. Yoshida, Y. Machida, K. Izawa, Y. Shimada, N. Nagasawa, T. Onimaru, T. Takabatake, A. Gourgout, A. Pourret, G. Knebel, and J.-P. Brison
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Journal Title
J. Phys. Soc. Jpn. (Editor’s choice)
Volume: 86
Issue: 4
Pages: 044711-044711
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System2016
Author(s)
T. Onimaru, K. Izawa, K. T. Matsumoto, T. Yoshida, Y. Machida, T. Ikeura, K. Wakiya, K. Umeo, S. Kittaka, K. Araki, T. Sakakibara, T. Takabatake
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Journal Title
Phys. Rev. B
Volume: 94
Issue: 7
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] 黒リンの低温熱輸送特性2017
Author(s)
町田洋, 井澤公一, Kamran Behnia, 秋葉和人, 三宅厚志, 徳永将史, 赤浜裕一
Organizer
日本物理学会第72 回年次大会
Place of Presentation
大阪大学
Year and Date
2017-03-17
Related Report
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