Fig 1.
Schematics of (a) the Eliashberg spectral function α2F(ω) and (b) the functional derivative of the superconducting critical temperature Tc concerning the α2F(ω) function, ΔTc/δα2F(ω).
Fig 2.
δTc/δα2F(ω) as a function of frequency ω for H3S calculated at different temperatures at pressures of a) 155GPa, b) 175 GPa, c) 195 GPa, and d) 215 GPa.
Stars show critical temperature related to corresponding pressure, horizontal arrows indicate frequency shift of the maximum value of the δTc/δα2F(ω), , red arrows present how δTc/δα2F(ω)-curve increases their separation, and vertical arrows point average frequency of intersection of the δTc/δα2F(ω).
Fig 3.
Frequency of the maximum of the δTc/δα2F(ω),, as a function of temperature, at different pressures.
The dashed boxes (yellow) show the slight change in induced by pressure.
Fig 4.
The parameter μ* as a function of temperature T for H3S at different pressures.
The horizontal band (yellow) marks the Δμ* within which the μ* fitted to the experimental Tc are set, indicated by the diagonal band (purple).