2015 Fiscal Year Final Research Report
Studies on superconducting properties and mechanisms of BiS2-based compounds and exploration of new functionality in related materials
| Project/Area Number |
25707031
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | BiCh2系層状化合物 / 元素置換 / 超伝導機構 / 化学圧力 / 新超伝導体探索 / トポロジカル超伝導候補物質 / 新熱電材料 / バンドエンジニアリング |
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| Outline of Final Research Achievements |
To clarify the superconducting properties and the mechanisms of superconductivity in the BiCh2-based (Ch: chalcogen) compounds, we have studied the physical properties and crystal structure of RE(O,F)BiCh2-type compounds. We revealed that the enhancement of in-plane chemical pressure should be essential for the induction of superconductivity and the increase of transition temperature (Tc) in the BiCh2-based superconductors.
New superconductors with a RE(O,F)BiCh2-type structure, new materials with SbS2-type layers, and a Sn1-xAgxTe superconductor, which may be related to topological superconductivity, were discovered during this project.
Furthermore, we have revealed that the Se-substituted LaOBiS2-xSex can be a promising thermoelectric material. The enhancement of in-plane chemical pressure by Se substitution resulted in large electron mobility without degradation of Seebeck coefficient; the highest dimensionless figure-of-merit (ZT) was 0.36 in LaOBiSSe.
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| Free Research Field |
固体物理学
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