2022 Fiscal Year Annual Research Report
Chemistry of open-shell carbon-based pi-electron molecular materials and development into spin liquids
| Project/Area Number |
21H01907
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| Research Institution | Osaka Metropolitan University |
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Principal Investigator |
プラシデス コスマス 大阪公立大学, 大学院理学研究科, 客員研究員 (90719006)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | carbon-based / molecular materials / spin liquids / polyaromatics / fullerenes |
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| Outline of Annual Research Achievements |
The project has developed new crystalline materials families whose building blocks are electronically-active π-electron unsaturated organic molecular anions of varying size, shape, and electronic structure. We have been employing the new chemistry we pioneered in recent years to control the positioning of the pi-electron open-shell building blocks in space and create geometrically-frustrated magnetic lattices, which can act as hosts of quantum spin liquids purely arising from carbon pi-electrons. These strongly-correlated Mott insulating phases are further manipulated chemically and physically to turn them into metals and superconductors. Chemical synthesis is integrated with state-of-the-art structural and magnetic measurement techniques to identify the new electronic states that arise. To date, we have established the fragility of the magnetic states to small perturbations induced by the chemical dopants that lead to transitions to long-range-ordered magnetic states, which were studied by ultralow temperature resonance techniques (NMR and muSR). At the same time, we found that incorporation of high-symmetry fullerene units leads to the isolation of hybrid systems, promising candidates of new electronic states.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The purpose of the project is to isolate new families of pi-electron carbon-based molecular materials and explore the emergence of new electronic properties. This is being successfully carried out to an advanced stage. In particular, reduced pi-electron families of polyaromatic hydrocarbons chemically synthesized in this work have allowed us to establish the influence of the nature of the dopant and the modified crystalline structures on the structural and electronic properties. In addition, we have successfully incorporated fullerenes into the polyaromatic hydrocarbon architectures. Structural and magnetic characterizations have been completed for proof-of-concept hybrid systems.
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| Strategy for Future Research Activity |
The research plan for the future years consists of three integrated components:
(A) Chemical synthesis. We will create new binary phases of reduced polyaromatic hydrocarbons and hybrid molecular solids doped with alkali metals.
(B) Structural analysis. We will carry out precise structural determination at low temperature and/or high pressure with synchrotron X-ray and neutron diffraction techniques probing accurately the changes in crystalline structure.
(C) Electronic properties. Detailed characterization of the electronic and magnetic properties will be pursued.
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| Remarks |
https://sites.google.com/omu.ac.jp/prassides-lab-osaka-metropolit/home
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