Fig. 4: The phase diagram of pressure-tuned Ising superconductivity of 4Hb-TaS₂.

a \({\Delta }_{\mathrm{SO}}\) and \({t}_{\perp }\) as functions of pressure. b Pressure-dependent ratio \({\Delta }_{\mathrm{SO}}/{t}_{\perp }\) extracted from first-principles calculations. The dashed lines in (a) and (b) are guides to the eye. c Transition temperatures of the CDW and superconducting orders as functions of pressure. d Phase diagram of \({{{\rm{\mu }}}_{0}H}_{{\rm{c}}2}^{\parallel }\) versus \({T}_{{\rm{c}}}\) for the TaS₂-related materials. The blue symbols indicate the mechanically exfoliated TaS₂ from monolayer to few layers⁵; the orange dot denotes chiral molecule–TaS₂ (MBA-TaS₂)¹⁶; the red triangle symbol represents the intercalated bulk 4Hb-TaS_1.99Se_0.01¹⁷; the black dot refers to the bulk 2H-TaS₂³³; the green symbols represent the metal atom-intercalated TaS₂ (from left to right: Pb_0.03TaS₂, Li_xTaS₂, Cu_0.03TaS₂, Ni_0.04TaS₂, and Na_0.1TaS₂)^{55,56,57,58,59}; the white dot denotes Ba_0.75ClTaS₂¹⁴; the red circles represent compressed 4Hb-TaS₂ presented in this work.