2015 Fiscal Year Final Research Report
Infrared optical study of charge glass and liquid states of charge ordered organic conductors
| Project/Area Number |
26800173
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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 | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 電荷秩序 / 電荷ガラス / 幾何学的フラストレーション / 有機導体 / 光学伝導度 / モット絶縁体 / 超伝導 |
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| Outline of Final Research Achievements |
In this study, we found a characteristic low-energy peak structure in the optical conductivity spectra of a quasi-2D organic compound with a triangular lattice, θ-(BEDT-TTF)2CsZn(SCN)4, in which competition between two kinds of charge-ordering patterns leads to a glassy CO state. We also performed optical conductivity measurements under high pressure for an antiferromagnetic dimer-Mott insulator β'-(BEDT-TTF)2ICl2 that shows superconductivity at 14.2 K under 8 GPa, which revealed that charge fluctuations inside of dimers plays an important role in the high-temperature superconductivity.
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| Free Research Field |
固体物理
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