Fig. 1: Temperature dependence of resistivity of MnSe at different pressures.

a below 11 GPa and b above 16 GPa where the resistance drop at low temperature appears. c shows the detailed resistive transition below 10 K, and d displays the resistive transition under different magnetic fields confirms the superconducting transition. e Field dependence of Tc obtained from RT data at 36 GPa. f Tc vs. P from RT measurements, where Tc is taken at the onset of resistive transition. The Tc is obtained by the intersection of two adjacent lines fit of dρ/dT as described in Supplementary Fig. S2.