Recently, the research team led by Yuan Xiang at the State Key Laboratory of Precision Spectroscopy at East China Normal University proposed and successfully synthesized a new ternary transition metal chalcogenide compound—Ta3VSe8. The related findings were published online in Micromachines under the title "Synthesis and Characterization of 2D Ternary Compound TMD Materials Ta3VSe8."
Two-dimensional van der Waals materials, particularly transition metal chalcogenides with rich properties, represent a promising research platform. Previous studies have primarily focused on binary transition metal chalcogenides, while research on ternary transition metal chalcogenides has been relatively limited. Additionally, ternary transition metal chalcogenides containing magnetic elements may have potential applications in magnetism and valleytronics.
In this study, the researchers obtained single crystals of Ta3VSe8 using the chemical vapor transport method in a dual-temperature furnace. The size of the crystals ranged from approximately 9 to 25 mm2, and their delaminable properties, along with their macro-layered and micro-step features, indicate a van der Waals layered structure similar to that of graphite. X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) confirmed the quality of the crystals and the uniformity of element distribution. Furthermore, Raman spectroscopy measurements at different temperatures, combined with electrical transport studies from liquid helium temperature to room temperature, revealed the phonon stability from low to high temperatures and the rapid suppression of positive magnetoresistance as the temperature increased.
This work was supported by the National Key R&D Program of China and the National Natural Science Foundation of China. The paper identifies Prof. Yuan as the corresponding author, with master's students Yuanji Ma (2020 cohort) and Yuhan Du (2021 cohort) as co-first authors.
More information: https://www.mdpi.com/2072-666X/15/5/591
