Strong electron-phonon coupling driven charge density wave states in stoichiometric 1T-VS2 crystals

Authors
Lee, Si-HongPark, Yun ChangChae, JinwoongKim, GunnKim, Hyuk JinChoi, Byoung KiLee, In HakChang, Young JunChun, Seung-HyunJung, MinkyungSeo, JungpilLee, Sunghun
Issue Date
2022-11
Publisher
Royal Society of Chemistry
Citation
Journal of Materials Chemistry C, v.44, pp.16617 - 16934
Abstract
A charge density wave (CDW) transition is one of the fundamental quantum phenomena used to unveil the interactions between electrons and phonons that are coexisting or competing with other intriguing quantum phases, such as superconducting and ferromagnetic phases. Layered van der Waals materials, especially the family of vanadium dichalcogenides (VS2, VSe2, and VTe2), have previously demonstrated CDW transition and ferromagnetic ordering, although these demonstrations lacked critical evidence. Among them, VS2 single crystals in bulk form are challenging materials due to their thermodynamical instability; thus, experiments involving these materials have been rare. Herein, we report the multiple CDW states of a perfect 1T-phase VS2 single crystal fabricated by chemical vapor transport and annealing treatment. The metastable phase comprising VS2 and V5S8 turned into a stoichiometric 1T-phase VS2 single crystal, confirmed by high-resolution microscopy. The fine structure formed at low temperature exhibits two clear CDW orders with the absence of nesting vectors on the Fermi surface, confirmed by scanning tunneling microscopy and density functional theory calculations. Our findings provide insight into obtaining a stable crystallographic phase of VS2, stimulating further research into its compelling physical properties.
Keywords
VANADIUM DISULFIDE NANOSHEETS; PHASE-TRANSITION; DYNAMICS; SULFIDES
ISSN
2050-7526
URI
https://pubs.kist.re.kr/handle/201004/114400
DOI
10.1039/d2tc04186c
Appears in Collections:
KIST Article > 2022
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