  We investigate the origin of Abelian and non-Abelian type magnetic
instabilities induced by Fermi surface mismatch between the two pairing
fermions in a non-relativistic model. The Abelian type instability occurs only
in gapless state and the Meissner mass squared becomes divergent at the
gapless-gapped transition point, while the non-Abelian type instability happens
in both gapless and gapped states and the divergence vanishes. The non-Abelian
type instability can be cured in strong coupling region.
