Thermoelectric study of quantum criticality in heavy-fermion metals
Project/Area Number |
23740263
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
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Research Institution | Tokyo Institute of Technology |
Principal Investigator |
MACHIDA Yo 東京工業大学, 大学院・理工学研究科, 助教 (40514740)
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Project Period (FY) |
2011 – 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: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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Keywords | 強相関系 / 重い電子系 / 熱電係数 / 量子臨界点 / 量子臨界現象 |
Research Abstract |
Quantum critical phenomena of the heavy-fermion materials have been studied by the low-temperature thermoelectric coefficient measurements. As a result, distinct nature of quantum criticality between two representative Yb-based quantum critical materials β-YbAlB4 and YbRh 2 Si2 has been revealed by contrasting behaviors of the Seebeck coefficient near their quantum critical points (QCP). Moreover, a satisfactory of the Wiedemann-Franz law has been verified in YbRh 2 Si2 at the QCP. These results place strong constraint on models for the quantum criticality of these materials.
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Report
(3 results)
Research Products
(19 results)
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[Presentation] Comparative Study on Quantum Criticality of β-YbAlB_4 and YbRh_2Si_2 via Thermal Transport Measurements2011
Author(s)
Y. Machida, K. Tomokuni, C. Ogura, K.Izawa, K. Kuga, S. Nakatsuji, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet
Organizer
SCES 2011
Place of Presentation
Cambridge, UK
Year and Date
2011-09-02
Related Report
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