An ab initio study finds Nb3Sn's superconducting gap is anisotropic yet fully open with 3D orbital pairing, and attributes the Hc2 drop at the martensitic transition to longer coherence lengths from Fermi-velocity redistribution.
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An $ab\;initio$ answer to long-debated questions about superconducting Nb$_3$Sn
An ab initio study finds Nb3Sn's superconducting gap is anisotropic yet fully open with 3D orbital pairing, and attributes the Hc2 drop at the martensitic transition to longer coherence lengths from Fermi-velocity redistribution.