S-WAVE SUPERCONDUCTIVITY IN WEAK FERROMAGNETIC METALS

We investigate the behaviour of weak ferromagnetic metals close to the ferromagnetic critical point. We show that in the limit of small magn etic moment the low temperature metallic phase is rigorously described by a local ferromagnetic Fermi liquid that has a momentum-independent self-energy. Whereas, non-Fermi liquid features develop at higher tem peratures. Furthermore, we find that an instability towards s-wave sup erconductivity is possible when the exchange splitting is comparable t o the superconducting gap.