Pressure Driven Competition between Superconductivity and Charge Density Wave States in BaSbTe2.1S0.9

BaSbTe2.1S0.9 (BSTS) is a newly discovered 2D layered material which exhibits charge density wave (CDW) order under ambient conditions. CDW is a correlated electronic phenomenon in a periodic modulation of charge density of a material. Both CDW and superconductivity are correlated states and often observed in the materials under different conditions. Currently, however, the correlation between the two states is not well understood. Here we present the pressure studies of the magnetic resistivity and XRD analysis of BSTS up to 30 GPa under quasi-hydrostaitc conditions where we show that CDW is suppressed under high pressure and leads to the emergence of superconductivity at around 10 Gpa. Our results support that CDW and superconductivity are competitive electronic states in BSTS.