Fig. 2
From: Observation of two superconducting domes under pressure in tetragonal FeS
a–c The normalized resistance curves of FeS single crystal under various pressures. d The superconducting transition of FeS at 19.0 GPa in various magnetic fields. The inset shows the reduced temperature (T = T c) dependence of the upper critical field H c2 (T). The solid line is a fit to the generalized Ginzburg–Landau model: H c2 (T) = H c2 (0) (1 - t 2)/(1 + t 2), where t = T/T c
