3-BODY BOUND-STATES AND THE DEVELOPMENT OF ODD-FREQUENCY PAIRING

We link the formation of an odd-frequency paired state to the developm ent of an anomalous three-body scattering amplitude. We show how a sim ple ansatz leads to a simple realization of odd-frequency superconduct ivity in a mean-field model of the Kondo lattice. The gapless quasipar ticles of this state are equal mixtures of particle and hole at zero f requency and their spin and charge coherence factors vanish, unlike co nventional even-paired BCS quasiparticles. We discuss the difficulties this and other models face in attempting to explain experiments in he avy-fermion superconductors.