2025/01/15 by T. Kobayashi, Kazuyoshi Yoshimi, Kobayashi, T. +13
Engineering · Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #FOS: Physical sciences #Molecular Junctions and Nanostructures #Organic and Molecular Conductors Research #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2501.08635
openalex publication_date 2025/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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\rm 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.