堆积
材料科学
相变
过渡金属
凝聚态物理
插层(化学)
格子(音乐)
相(物质)
超导电性
结晶学
化学物理
订单(交换)
纳米技术
物理
化学
无机化学
量子力学
催化作用
经济
生物化学
核磁共振
声学
财务
作者
Xiaohui Yang,Jin‐Ke Bao,Zhefeng Lou,Peng Li,Chenxi Jiang,Jialu Wang,Tulai Sun,Yabin Liu,Wei Guo,S. Ramakrishnan,Surya Rohith Kotla,Martin Tolkiehn,Carsten Paulmann,Guang‐Han Cao,Yuefeng Nie,Wenbin Li,Yang Liu,Sander van Smaalen,Xiao Lin,Zhu‐An Xu
标识
DOI:10.1002/adma.202108550
摘要
Intercalation and stacking-order modulation are two active ways in manipulating the interlayer interaction of transition metal dichalcogenides (TMDCs), which lead to a variety of emergent phases and allow for engineering material properties. Herein, the growth of Pb-intercalated TMDCs-Pb(Ta1+x Se2 )2 , the first 124-phase, is reported. Pb(Ta1+x Se2 )2 exhibits a unique two-step first-order structural phase transition at around 230 K. The transitions are solely associated with the stacking degree of freedom, evolving from a high-temperature (high-T) phase with ABC stacking and R3m symmetry to an intermediate phase with AB stacking and P3m1, and finally to a low-temperature (low-T) phase again with R3msymmetry, but with ACB stacking. Each step involves a rigid slide of building blocks by a vector [1/3, 2/3, 0]. Intriguingly, gigantic lattice contractions occur at the transitions on warming. At low-T, bulk superconductivity with Tc ≈ 1.8 K is observed. The underlying physics of the structural phase transitions are discussed from first-principle calculations. The symmetry analysis reveals topological nodal lines in the band structure. The results demonstrate the possibility of realizing higher-order metal-intercalated phases of TMDCs and advance the knowledge of polymorphic transitions, and may inspire stacking-order engineering in TMDCs and beyond.
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