Two-step charge density wave transition and hidden transient phase in 1 T – TiSe 2
Journal Article
·
· Physical Review. B
- Central Michigan Univ., Mount Pleasant, MI (United States); Central Michigan University
- Central Michigan Univ., Mount Pleasant, MI (United States); SGT University, Gurugram (India)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Central Michigan Univ., Mount Pleasant, MI (United States)
Using variable temperature atomic pair distribution function analysis, we study the emergence of charge density wave (CDW) order in 1T-TiSe2 and find that it takes place via a two-step transition. First, upon decreasing temperature to about 235(3) K, CDW related lattice distortions emerge in the individual TiSe2 layers alone. Then, upon further decreasing the temperature, the two-dimensional distortions in the layers couple and the widely recognized three-dimensional 2ao x 2ao x 2co superstructure emerges at about 205(3) K. Because two different band gaps are known to emerge at the same temperatures, the finding indicates the presence of strong electron-phonon coupling. The transient phase between the two steps lacks inversion symmetry and may serve as a precursor of the debated chiral 1T-TiSe2 phase. Finally, our findings are important for the understanding of the enigmatic CDW transition in 1T-TiSe2 and CDW instabilities in van der Waals materials in general.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; SC0021973
- OSTI ID:
- 2337944
- Alternate ID(s):
- OSTI ID: 2341872
OSTI ID: 2473811
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 109; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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