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Stacking order dynamics in the quasi-two-dimensional dichalcogenide 1 T -TaS2 probed with MeV ultrafast electron diffraction

Journal Article · · Structural Dynamics
DOI:https://doi.org/10.1063/1.4982918· OSTI ID:2565535
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Transitions between different charge density wave (CDW) states in quasi-two-dimensional materials may be accompanied also by changes in the inter-layer stacking of the CDW. Using MeV ultrafast electron diffraction, the out-of-plane stacking order dynamics in the quasi-two-dimensional dichalcogenide 1T-TaS2 is investigated for the first time. From the intensity of the CDW satellites aligned around the commensurate l = 1/6 characteristic stacking order, it is found out that this phase disappears with a 0.3 ps time constant. Simultaneously, in the same experiment, the emergence of the incommensurate phase, with a slightly slower 2.0 ps time constant, is determined from the intensity of the CDW satellites aligned around the incommensurate l = 1/3 characteristic stacking order. These results might be of relevance in understanding the metallic character of the laser-induced metastable “hidden” state recently discovered in this compound.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2565535
Alternate ID(s):
OSTI ID: 1361867
OSTI ID: 1369308
Journal Information:
Structural Dynamics, Journal Name: Structural Dynamics Journal Issue: 4 Vol. 4; ISSN 2329-7778
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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