TOTAL SPIN AND ANTIFERROMAGNETIC CORRELATION IN THE KONDO MODEL

In this paper, we present two theorems on the total spin and the sign of the transverse spin-spin correlation. For a half-filled single-chan nel or multichannel Kondo model with or without a Hubbard term for con duction electrons, we calculate the total spin in the ground state, wh ich depends on the lattice, on the distribution of the localized elect ron, and on the sign of the exchange coupling J. The stability of thes e magnetic properties against Coulomb interaction between conduction e lectrons is also discussed.