| 研究実績の概要 |
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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