Commensurate Stacking Phase Transitions in an Intercalated Transition Metal Dichalcogenide

Commensurate Stacking Phase Transitions in an Intercalated Transition Metal Dichalcogenide

© 2021 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 6 vom: 06. Feb., Seite e2108550
1. Verfasser: Yang, Xiaohui (VerfasserIn)
Weitere Verfasser: Bao, Jin-Ke, Lou, Zhefeng, Li, Peng, Jiang, Chenxi, Wang, Jialu, Sun, Tulai, Liu, Yabin, Guo, Wei, Ramakrishnan, Sitaram, Kotla, Surya Rohith, Tolkiehn, Martin, Paulmann, Carsten, Cao, Guang-Han, Nie, Yuefeng, Li, Wenbin, Liu, Yang, van Smaalen, Sander, Lin, Xiao, Xu, Zhu-An
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article intercalated transition metal dichalcogenides stacking phase transitions superconductivity topological bands
Beschreibung
Zusammenfassung:© 2021 Wiley-VCH GmbH.
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
Beschreibung:Date Revised 10.02.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202108550