Pressure-induced topological changes in Fermi surface of two-dimensional molecular conductor
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911177184903168 |
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| author | Kobayashi, T. Yoshimi, K. Ma, H. Sekine, S. Taniguchi, H. Matsunaga, N. Kawamoto, A. Uwatoko, Y. |
| author_facet | Kobayashi, T. Yoshimi, K. Ma, H. Sekine, S. Taniguchi, H. Matsunaga, N. Kawamoto, A. Uwatoko, Y. |
| contents | We demonstrated X-ray structural analysis of the pressure-induced superconductor, $β'$-ET$_2$ICl$_2$ under extremely high-pressure conditions, where ET denotes bis(ethylenedithio)tetrathiafulvalene. This material has been known as the highest transition temperature ($T_c$) superconductor among organic superconductors ($T_c=14.2$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_08635 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pressure-induced topological changes in Fermi surface of two-dimensional molecular conductor Kobayashi, T. Yoshimi, K. Ma, H. Sekine, S. Taniguchi, H. Matsunaga, N. Kawamoto, A. Uwatoko, Y. Superconductivity Strongly Correlated Electrons We demonstrated X-ray structural analysis of the pressure-induced superconductor, $β'$-ET$_2$ICl$_2$ under extremely high-pressure conditions, where ET denotes bis(ethylenedithio)tetrathiafulvalene. This material has been known as the highest transition temperature ($T_c$) superconductor among organic superconductors ($T_c=14.2$ 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. |
| title | Pressure-induced topological changes in Fermi surface of two-dimensional molecular conductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.08635 |