Speaker
Description
NbS2 is a layered substance, which has recently shown great promise for building superconducting devices in the 2D limit [1,2]. While the layers consist of covalently bound atoms, weak van der Waals forces hold the layers together. NbS2 crystallises in two stable polymorphs, depending on the sulfur pressure during synthesis: the superconducting 2H phase and the metallic 3R phase[3–5].
We have in a systematic approach analysed this sensitive sulfur-pressure system by modifying the amount of sulfur and the temperature in the synthesis conditions. Based on the results, we established a phase diagram for the given synthesis conditions.
The here obtained synthesis parameters allow for an improved control of the phase purity and phase formation in the NbS2 system.
