High-Pressure Control of Vanadium Self-Intercalation and Enhanced Metallic Properties in 1T-V1+xS2 Single Crystals
- 14 June 2016
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 55 (13), 6481-6486
- https://doi.org/10.1021/acs.inorgchem.6b00532
Abstract
By means of high-pressure synthesis in the 4-6 GPa range, we report on the successful growth of high-quality 1T-V1+xS2 single crystals with controlled concentration, x = 0.09-0.17, of self-intercalated V atoms in the van der Waals gap. A systematic X-ray diffraction and energy-dispersive X-ray spectroscopy study unveils a linear decrease of x with the synthesis pressure, dx/dP = -0.042 GPa(-1), suggesting that the stoichiometric (x = 0) phase is stable above 8 GPa. Transmission electron microscopy and electrical resistivity measurements show that, for all x values studied, the system is metallic up to 400 K, with no charge-density-wave order, contrary to the x = 0 composition. This finding clarifies the controversial electronic phase diagram of the 1T-V1+xS2 system and unveils a connection between the charge-density-wave phase observed at x = 0 and the itinerant antiferromagnetic phase stable for x > 0.25.Funding Information
- Université Pierre et Marie Curie (EME1106)
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