First-order transition from superfluid to bose-metal state in systems with resonant pairing

Systems showing resonant superfluidity, driven by an exchange coupling of strength g between uncorrelated pairs of itinerant fermions and tightly bound ones, undergo a first-order phase transition as g increases beyond some critical value gc. The superfluid phase for ggc this state gives way to a phase-uncorrelated bosonic liquid with a q2 spectrum.