Excitation Spectra of the Two Impurity Anderson Model. II. Interplay between the Kondo Effect and the Inter Site Interactions

Excitation spectra of the two impurity Anderson model are calculated for various parameter regions of the f-f transfer, t, c-f hybridization and the exchange coupling between local spins. The parity dependent potential scattering suppresses the critical transition pointed out by Jones et al. In the case of small t, the parity splitting of the f-level is given by t/Z, where Z is the enhancement factor of the specific heat in the single impurity problem. In the case of large t, γ of the electronic specific heat decreases drastically and the parity splitting increases largely. The splitting remains to be order of t/Z if the induced kinetic exchange coupling is compensated by other mechanism. The fluctuation of the singlet non-uniform superconductivity is relatively large in the electron-hole asymmetric case, but its intensity is about 1/10 of the antiferromagnetic one.