Pan Zhichao, Huang Xing, Fan Yunlong, Wang Shaoze, Liu Yiyu, Cong Xuzhong, Zhang Tingsong, Qi Shichao, Xing Ying, Zheng Yu-Qing, Li Jian, Zhang Xiaoming, Xu Wei, Sun Lei, Wang Jian, Dou Jin-Hu
National Key Laboratory of Advanced Micro and Nano Manufacture Technology, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
Nat Commun. 2024 Oct 29;15(1):9342. doi: 10.1038/s41467-024-53786-1.
Two-dimensional conjugated coordination polymers exhibit remarkable charge transport properties, with copper-based benzenehexathiol (Cu-BHT) being a rare superconductor. However, the atomic structure of Cu-BHT has remained unresolved, hindering a deeper understanding of the superconductivity in such materials. Here, we show the synthesis of single crystals of CuBHT with high crystallinity, revealing a quasi-two-dimensional kagome structure with non-van der Waals interlayer Cu-S covalent bonds. These crystals exhibit intrinsic metallic behavior, with conductivity reaching 10S/cm at 300 K and 10S/cm at 2 K. Notably, superconductivity in CuBHT crystals is observed at 0.25 K, attributed to enhanced electron-electron interactions and electron-phonon coupling in the non-van der Waals structure. The discovery of this clear correlation between atomic-level crystal structure and electrical properties provides a crucial foundation for advancing superconductor coordination polymers, with potential to revolutionize future quantum devices.
二维共轭配位聚合物表现出卓越的电荷传输特性，其中铜基苯六硫醇（Cu-BHT）是一种罕见的超导体。然而，Cu-BHT的原子结构尚未得到解析，这阻碍了对这类材料中超导性的深入理解。在此，我们展示了具有高结晶度的CuBHT单晶的合成，揭示了一种具有非范德华层间Cu-S共价键的准二维 Kagome结构。这些晶体表现出本征金属行为，在300 K时电导率达到10 S/cm，在2 K时达到10 S/cm。值得注意的是，在0.25 K时观察到CuBHT晶体中的超导性，这归因于非范德华结构中增强的电子-电子相互作用和电子-声子耦合。这种原子级晶体结构与电学性质之间明确关联的发现为推进超导配位聚合物提供了关键基础，有望彻底改变未来的量子器件。
