中科院物理所陈小龙团队报道了簇组装Au6Te12Se8超导体中的超原子电荷密度波。相关研究成果发表在2022年10月27日出版的国际学术期刊《美国化学会杂志》。

第二近红外（NIR-II）有机光热超原子晶体的性能是一类分级材料，由通过范德华或类共价相互作用组装的原子精确簇组成。Au6Te12Se8是一种表现出超原子电荷密度波（S-CDW）的全无机超原子超导体，它为研究其集体量子现象对超原子晶体外部压力的响应提供了第一个平台。

研究人员揭示了超窄压力范围内S-CDW与超导之间的竞争。与传统的CDW排序不同，S-CDW显示出对外部压力的最低阈值（0.1 GPa），比其他原子化合物低1-2个数量级。值得注意的是，第二个超导相出现在7.3GPa以上，转变温度（Tc）提高了三倍，达到8.5K，表明传导通道从a轴切换到b轴。原位同步辐射衍射和理论计算揭示，超原子的压力介导介观滑移和费米表面拓扑的2D-3D转变，这很好地解释了所观察到的电导率和可重入超导性的维度交叉。

附：英文原文

Title: Superatomic-Charge-Density-Wave in Cluster-Assembled Au6Te12Se8 Superconductors

Author: Xu Chen, Ge Fei, Yanpeng Song, Tianping Ying, Dajian Huang, Bingying Pan, Dongliang Yang, Xiaofan Yang, Keyu Chen, Xinhui Zhan, Junjie Wang, Qinghua Zhang, Yanchun Li, Lin Gu, Huiyang Gou, Xin Chen, Shiyan Li, Jinguang Cheng, Xiaobing Liu, Hideo Hosono, Jian-gang Guo, Xiaolong Chen

Issue&Volume: October 27, 2022

Abstract: Superatomic crystals are a class of hierarchical materials composed of atomically precise clusters assembled via van der Waals or covalent-like interactions. Au6Te12Se8, an all-inorganic superatomic superconductor exhibiting superatomic-charge-density-wave (S-CDW), provides the first platform to study the response of its collective quantum phenomenon to the external pressure in superatomic crystals. We reveal a competition between S-CDW and superconductivity in an ultra-narrow pressure range. Distinct from conventional CDW ordering, S-CDW shows the lowest threshold (0.1 GPa) toward external pressure that is 1–2 orders of magnitude lower than other atomic compounds. Prominently, a second superconducting phase emerges above 7.3 GPa with a threefold enhancement in the transition temperature (Tc) to 8.5 K, indicating a switch of the conduction channel from the a- to b-axis. In situ synchrotron diffractions and theoretical calculations reveal a pressure-mediated mesoscopic slip of the superatoms and a 2D-3D transition of the Fermi surface topology, which well explains the observed dimensional crossover of conductivity and re-entrant superconductivity.

DOI: 10.1021/jacs.2c09499

Source: https://pubs.acs.org/doi/10.1021/jacs.2c09499