北京大学材料科学与工程学院王永刚小组报道了准一维反铁磁体CrSbS₃的序贯电荷转移和磁有序。2025年2月26日，国际知名学术期刊《美国化学会杂志》发表了这一成果。

课题组人员提出了具有准一维结构的反铁磁CrSbS₃中温度诱导的顺序电荷转移和磁有序的独特情况。有趣的是，Cr和[Sb₂S₆]单元之间的电荷转移和反铁磁跃迁对晶格膨胀的不同影响导致了晶格参数的不同热膨胀行为，最终导致了晶格体积的反因瓦尔效应。中子粉末衍射进一步揭示了C型反铁磁序。

此外，压力调节也可以诱导类似的体积坍塌，这意味着潜在的价态和自旋态转变。在CrSbS₃中观察到的多重电子跃迁为破译电荷、自旋和晶格自由度之间的交织提供了一个有价值的平台，并为探索更低维范德华材料中的新量子现象提供了新的视角。

据悉，电荷转移和磁有序是赋予材料不同结构和性质的两种深奥的凝聚态现象。然而，这两种效应很少在单一材料中连续发生。

附：英文原文

Title: Sequential Charge Transfer and Magnetic Ordering in Quasi-One-Dimensional Antiferromagnet CrSbS3

Author: Chen Li, Ke Liu, Yiming Wang, Chenjie Lou, Nana Li, Jiajia Feng, Haoming Cheng, Qi Feng, Dequan Jiang, Jiazheng Hao, Xiaoli Ma, Ting Wen, Lunhua He, Xiaohui Yu, Binbin Yue, Yonggang Wang

Issue&Volume: February 26, 2025

Abstract: Charge transfer and magnetic ordering are two profound condensed matter phenomena that impart distinct structures and properties to materials. However, such two effects rarely occur successively within a single material. Here, we present a unique case of temperature-induced sequential charge transfer and magnetic ordering in antiferromagnetic CrSbS₃ with quasi-one-dimensional structure. Intriguingly, the contrasting effects of charge transfer between Cr and [Sb₂S₆] units and antiferromagnetic transition on lattice expansion result in diverse thermal expansion behaviors of lattice parameters, which ultimately leads to an anti-Invar effect on the lattice volume. Neutron powder diffraction further unravels a C-type antiferromagnetic order. Moreover, pressure regulation can also induce similar volume collapse, implying potential valence and spin-state transitions. The multiple electronic transitions observed in CrSbS3 offer a valuable platform for deciphering the interweaving among charge, spin, and lattice degrees of freedom, and shed a new light for exploring novel quantum phenomena in more low-dimensional van der Waals materials.

DOI: 10.1021/jacs.4c17892

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c17892