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We show the emergence of a new class of superconductivity in multiorbitalsystems, focusing on non-Kramers f$^2$ states. The Cooper pairs in this classof superconductivity mainly consist of local pairs with the same symmetry asthe local f$^2$ ground states. When the local ground state is an anisotropicrepresentation, the superconducting gap has nodes on the Fermi surface. Thisnodal superconductivity is mediated by the strong onsite inter-orbitalattractions as a consequence of negative-$U$ physics generalized tomultiorbital systems. We show that this is indeed realized in a simpletwo-orbital model with antiferro Hund's coupling and enhanced inter-orbitalinteraction derived via a systematic local down folding. Finally, we brieflydiscuss superconductivity in Pr-1-2-20 compounds, UBe$_{13}$, andPrOs$_4$Sb$_{12}$ in view of the present mechanism.

Local nodal Cooper pairs in multiorbital systems