Fig. 6: d_xy hole pocket and its impact on superconductivity.

For both non-intercalated (a–d) and intercalated (e–h) the electronic band structure is shown along M–Γ–A path for different values of shift δ_xy in potential. Red represents the d_xy orbital character and green represents d_xz,yz orbital characters. The leading superconducting eigenvalues λ remains roughly 4–5 times larger in intercalated samples for all δ_xy (the reported values for λ are at 300 K, which is the lowest temperature where we could compute λ reliably in all cases). The pairing vertex Γ^pp uniformly enhances by similar factors in intercalated variants for all such δ_xy, as the electron pockets around M and A, always contain significant d_xy component.