2013 Fiscal Year Final Research Report
Quantum Critical Phenomena and the Crystal Structure in Yb-based heavy fermion system
| Project/Area Number |
24740243
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo (2013)
Nihon University (2012) |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 量子臨界現象 / イットリウム化合物 / 非フェルミ液体 / 重い電子系 / X線回折 |
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| Research Abstract |
We study the Yb based heavy fermion compounds, YbAlB4, which is example of quantum criticality in a mixed-valence system at ambient pressure and superconducting transition at 80mK. Our investigation for the pressure vs temperature phase diagram for the superconducting state near quantum critical point (QCP), a pressure-induced magnetic order, and crystal structure under pressure lead to an important result for the Yb based heavy fermion superconducting system near QCP.
Specially, the superconducting state is isolated and exists without connecting magnetic order where Normally, quantum criticality of an Yb-based heavy fermion system is found next to a magnetic order stabilized by application of pressure.Moreover, this non-Fermi liquid hidden by the superconducting state is robust against the pressure. which is ever known at all. But, it is thought that this Yb material exhibits a new type superconductivity and a unconventional quantum criticality.
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[Journal Article] Pressure-Induced Enhancement of Superconductivity and Structural Transition in BiS2-Layered LaO1−xFxBiS22014
Author(s)
Takahiro Tomita, Masaya Ebata, Hideto Soeda, Hiroki Takahashi, Hiroshi Fujihisa, Yoshito Gotoh, Yoshikazu Mizuguchi, Hiroki Izawa, Osuke Miura, Satoshi Demura, Keita Deguchi, and Yoshihiko Takano
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Journal Title
Journal of the Physical Society of Japan
Volume: 83
Pages: 063704
DOI
Peer Reviewed
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