Pressure-induced topological changes in Fermi surface of two-dimensional molecular conductor
Abstract
We demonstrated X-ray structural analysis of the pressure-induced superconductor, β'-ET2ICl2 under extremely high-pressure conditions, where ET denotes bis(ethylenedithio)tetrathiafulvalene. This material has been known as the highest transition temperature (Tc) superconductor among organic superconductors (Tc=14.2 K at 8.2 GPa). On the basis of the experimental results, ab-initio models were derived using the constrained random phase approximation. We revealed that the Lifshitz transition exists behind the Mott insulator-metal transition and found that the value of the on-site Coulomb interaction was halved to around 10 GPa compared to that at ambient pressure. This study clarifies the enigmatic origins of high T c, and concurrently, provides a new understanding of the impacts of structural alterations in organic materials under high pressure on their electronic properties and the superconductivity process.
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