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Two-step charge density wave transition and hidden transient phase in 1T TiSe2

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4]
  1. Central Michigan Univ., Mount Pleasant, MI (United States); Central Michigan University
  2. Central Michigan Univ., Mount Pleasant, MI (United States); SGT University, Gurugram (India)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. 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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