Fig. 2: BCS eigenvalue λBCS.
From: Theory of superconductivity in doped quantum paraelectrics
Comparison between the BCS eigenvalue λBCS dome in the three-orbital model of Eq. (2) and the single-band model of Eq. (1). In the former, the weak tetragonal crystal field strength of ~2.2 meV15 has been included, which has little effect around the optimal doping. For a better comparison on the superconducting dome, both lines are rescaled with respect to their maximal value. λ/λmax is the rescaled BCS eigenvalue. Red line is the result from single-band estimation, while blue line is the result from three-band calculation.
