Superconductivity in the Dense Kondo System

Abstract

The s·wave superconductivitY in the dense Kondo system, Le., in the heavy fermion system is studied. The interaction potential between these heavy fermions is considered to be positive in the whole region of the momentum space, since motion of the heavy fermions is much slower than that of the lattice.. This fact seems to be unfavorable to the s-wave superconductivity. However,jt is shown that the s-wave supercon-ductivity is possible, if the wave-vector dependence of the interaction potential between pair fermions is taken into account.