2017 Fiscal Year Annual Research Report
Hybrid f-/p-electron molecular materials
Publicly Offered Research
| Project Area | J-Physics: Physics of conductive multipole systems |
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| Project/Area Number |
16H01063
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| Research Institution | Tohoku University |
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Principal Investigator |
プラシデス コスマス 東北大学, 材料科学高等研究所, 教授 (90719006)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 強相関電子系 / 超伝導 / フラーレン / 希土類元素 / 複合材料・物性 |
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| Outline of Annual Research Achievements |
The project has focussed on research in emergent electronic phenomena in the family of hybrid f-/p-electron molecular materials successfully established for the first time by our work to-date within J-Physics. In order to achieve our targets, we synthesized and researched new families of molecular-based strongly correlated f-electron fullerides in which the presence of the electronically-active C60 anions is combined with mixed configuration rare earths leading to properties intrinsically unattainable in any other system currently available. Strong correlations dominate the electronic properties of both the rare-earth cation and the C60 anion sublattices. To-date the project has unambiguously authenticated by both synchrotron X-ray diffraction and spectroscopic techniques at ambient and elevated pressures the occurrence of valence transitions with novel characteristics arising from the simultaneous presence of the electronically-active C60 sublattice. Moreover, it has also led to a family of mixed valence materials with chemically (and potentially physically) quasi-continuously tunable valence transitions opening up the possibility of unveiling a new type of quantum criticality caused by critical valence fluctuations. Finally, the orbitally selective (Jahn-Teller) metallic state, which is the parent of the highest-Tc fulleride superconductor appears to be harboring a hidden quadrupolar order, key to the understanding of the intriguing electronic properties of this state of matter.
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| Research Progress Status |
29年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
29年度が最終年度であるため、記入しない。
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[Journal Article] π-electron S = 1/2 quantum-spin-liquid state in an ionic polyaromatic hydrocarbon2017
Author(s)
Y. Takabayashi, M. Menelaou, H. Tamura, N. Takemori, T. Koretsune, A. Stefancic, G. Klupp, A. J. C. Buurma, Y. Nomura, R. Arita, D. Arcon, M. J. Rosseinsky and K. Prassides
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Journal Title
Nature Chemistry
Volume: 9
Pages: 635～643
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids2017
Author(s)
F. D. Romero, M. J. Pitcher, C. I. Hiley, G. F. S. Whitehead, S. Kar, A. Y. Ganin, D. Antypov, C. Collins, M. S. Dyer, G. Klupp, R. H. Colman, K. Prassides and M. J. Rosseinsky
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Journal Title
Nature Chemistry
Volume: 9
Pages: 644～652
DOI
Peer Reviewed / Int'l Joint Research
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