Cc. Yu et Sr. White, THE INTERPLAY OF THE KONDO EFFECT AND RKKY INTERACTIONS IN THE ONE-DIMENSIONAL KONDO INSULATOR, Physica. B, Condensed matter, 199, 1994, pp. 454-456
We have studied the one-dimensional Kondo chain at half-filling using
a density matrix formulation of the numerical renormalization group. A
s the exchange coupling J --> 0, RKKY interactions become more importa
nt, and the correlation length and the staggered susceptibility chi(q
= 2k(F)) diverge.