Fig. 4: Superconducting properties of the \(Fm\bar{3}m\) and \(P\bar{4}3m\) structure.
From: Vacancy-free cubic superconducting NbN enabled by quantum anharmonicity

Temperature dependence of the superconducting gap Δ0 from isotropic ME calculations45. Results for the P\(\bar{4}3m\) and Fm\(\bar{3}m\) phases are shown as dots and triangles, respectively. Dashed lines are guides to the eye. The inset shows the P\(\bar{4}3m\) Fermi surface, visualized with FermiSurfer76 and colored by λk from an anisotropic ME calculation46,73.