Fig. 4
From: High-\(T_c\) superconductivity with quadratic electron-phonon coupling
Superconducting gap (\(\Delta _0\)) at \(T=0\) versus g. The curve mirrors \(T_c\) with peak at \(\Delta _0 \approx 25\) meV for \(g \approx 0.35\) eV, error bars larger near peak.
