Figure 4
From: Emergence of double-dome superconductivity in ammoniated metal-doped FeSe
(a) R vs. T plots for (NH3)yCs0.4FeSe at pressures of 16–41 GPa. Inset of (a): R vs. T plots for (NH3)yCs0.4FeSe at 21 GPa at 0, 3 and 7 T. (b) Tc vs. p plot (p = 0–41 GPa) determined from the temperature dependence of M/H, χ′ and R for (NH3)yCs0.4FeSe (sample 1 (first batch)) under pressure. Colours of plots in the pressure range below 13 GPa correspond to those in Figure 1(c). The star refers to the Tc determined from the R vs. T plot. (c) Tc vs. p plot (p = 0–14 GPa) determined from the temperature dependence of R for (NH3)yCs0.4FeSe (sample 2 and 3 (second batch)) under pressure. Colours of plots in blue and purple refer to the samples 2 and 3, respectively. (d) Tc vs. p plot (p = 0–41 GPa) constructed by combining the Tc vs. p plots shown in Figures 4(b) and (c). In (b) and (d), the arrows indicate Tc′s lower than the temperatures denoted by bars.
