Charge-Transfer Complex $κ$-(BEST)$_2$Cu$_2$(CN)$_3$ Analogous to Organic Spin Liquid Candidate
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916971125145600 |
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| author | Kobayashi, Takuya Sakurai, Kent Andrew Michimura, Shinji Taniguchi, Hiromi |
| author_facet | Kobayashi, Takuya Sakurai, Kent Andrew Michimura, Shinji Taniguchi, Hiromi |
| contents | We report the structural, electrical, and magnetic properties of the organic conductor $κ$-(BEST)$_2$Cu$_2$(CN)$_3$ (BEST: bis(ethylenediseleno)tetrathiafulvalene; abbreviated as $κ$-BEST-CN), which is isostructural with the quantum spin liquid candidate $κ$-(ET)$_2$Cu$_2$(CN)$_3$ (ET: bis(ethylenedithio)tetrathiafulvalene; abbreviated as $κ$-ET-CN). Resistivity measurements demonstrate that $κ$-BEST-CN exhibits semiconducting behavior, governed by the same conducting mechanism as $κ$-ET-CN. Under a pressure of ~0.1 GPa, $κ$-BEST-CN undergoes a superconducting transition with an onset temperature of ~4 K. From the comparison of the critical pressures of superconductivity between $κ$-ET-CN and $κ$-BEST-CN, $κ$-BEST-CN can be regarded as a chemically pressurized analogue of $κ$-ET-CN. Therefore, $κ$-BEST-CN, in which only the effective pressure changes without altering the anion structure, is considered a valuable reference material for elucidating the enigmatic properties observed in $κ$-ET-CN. Furthermore, the spin susceptibility of $κ$-BEST-CN is slightly larger than that of $κ$-ET-CN and shows weaker temperature dependence, which cannot be explained by the localized spin model. This behavior clarifies the anomalous magnetic properties of a system with frustration near the Mott transition, serving to stimulate future theoretical research. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_21343 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Charge-Transfer Complex $κ$-(BEST)$_2$Cu$_2$(CN)$_3$ Analogous to Organic Spin Liquid Candidate Kobayashi, Takuya Sakurai, Kent Andrew Michimura, Shinji Taniguchi, Hiromi Strongly Correlated Electrons Superconductivity We report the structural, electrical, and magnetic properties of the organic conductor $κ$-(BEST)$_2$Cu$_2$(CN)$_3$ (BEST: bis(ethylenediseleno)tetrathiafulvalene; abbreviated as $κ$-BEST-CN), which is isostructural with the quantum spin liquid candidate $κ$-(ET)$_2$Cu$_2$(CN)$_3$ (ET: bis(ethylenedithio)tetrathiafulvalene; abbreviated as $κ$-ET-CN). Resistivity measurements demonstrate that $κ$-BEST-CN exhibits semiconducting behavior, governed by the same conducting mechanism as $κ$-ET-CN. Under a pressure of ~0.1 GPa, $κ$-BEST-CN undergoes a superconducting transition with an onset temperature of ~4 K. From the comparison of the critical pressures of superconductivity between $κ$-ET-CN and $κ$-BEST-CN, $κ$-BEST-CN can be regarded as a chemically pressurized analogue of $κ$-ET-CN. Therefore, $κ$-BEST-CN, in which only the effective pressure changes without altering the anion structure, is considered a valuable reference material for elucidating the enigmatic properties observed in $κ$-ET-CN. Furthermore, the spin susceptibility of $κ$-BEST-CN is slightly larger than that of $κ$-ET-CN and shows weaker temperature dependence, which cannot be explained by the localized spin model. This behavior clarifies the anomalous magnetic properties of a system with frustration near the Mott transition, serving to stimulate future theoretical research. |
| title | Charge-Transfer Complex $κ$-(BEST)$_2$Cu$_2$(CN)$_3$ Analogous to Organic Spin Liquid Candidate |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2507.21343 |