TY  - JOUR
AU  - Yang, Xiaohui
AU  - Bao, Jin-Ke
AU  - Lou, Zhefeng
AU  - Li, Peng
AU  - Jiang, Chenxi
AU  - Wang, Jialu
AU  - Sun, Tulai
AU  - Liu, Yabin
AU  - Guo, Wei
AU  - Ramakrishnan, Sitaram
AU  - Kotla, Surya Rohith
AU  - Tolkiehn, Martin
AU  - Paulmann, Carsten
AU  - Cao, Guang-Han
AU  - Nie, Yuefeng
AU  - Li, Wenbin
AU  - Liu, Yang
AU  - van Smaalen, Sander
AU  - Lin, Xiao
AU  - Xu, Zhu-An
TI  - Commensurate Stacking Phase Transitions in an Intercalated Transition Metal Dichalcogenide
JO  - Advanced materials
VL  - 34
IS  - 6
SN  - 0935-9648
CY  - Weinheim
PB  - Wiley-VCH
M1  - PUBDB-2022-00563
SP  - 2108550 -
PY  - 2022
N1  - Waiting for fulltext
AB  - 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(Ta<sub>1+x</sub>Se<sub>2</sub>)<sub>2</sub>, the first 124-phase, is reported. Pb(Ta<sub>1+x</sub>Se<sub>2</sub>)<sub>2</sub> 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 R<sub>3</sub>msymmetry, 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:34871466
UR  - <Go to ISI:>//WOS:000732521900001
DO  - DOI:10.1002/adma.202108550
UR  - https://bib-pubdb1.desy.de/record/474173
ER  -