Fig. 2: Mean-field results for the spatially homogeneous d-wave superconductor.

a,b Self-consistent solutions of the pairing order parameter Δ(T) and the chemical potential μ(T) for three representative values of α. Temperatures are normalized to the instability temperature T_i defined as the temperature at which the static pairing susceptibility L_q=0 diverges, while Δ and μ are scaled with Λ. c Instability temperature T_i and chemical potential μ_i ≡ μ(T = T_i) as a function of α. d T = 0 solutions: Δ₀ ≡ Δ(T = 0) and chemical potential μ₀ ≡ μ(T = 0) as a function of α. For comparison we show also the results of the isotropic s-wave case in dashed lines. Computations are performed using Λ = 11, E_F = 2.2 in units of 2m = 1.