  Observing that several U and Ce based candidate triplet superconductors share
a common structural motif, with pairs of magnetic atoms separated by an
inversion center, we hypothesize a triplet pairing mechanism based on an
interplay of Hund's and Kondo interactions that is unique to this structure. In
the presence of Hund's interactions, valence fluctuations generate a triplet
superexchange between electrons and local moments. The offset from the center
of symmetry allows spin-triplet pairs formed by the resulting Kondo effect to
delocalize onto the Fermi surface, precipitating superconductivity. We
demonstrate this mechanism within a minimal two-channel Kondo lattice model and
present support for this pairing mechanism from existing experiments.
