S. Moukouri et Lg. Caron, FERMI-SURFACE OF THE ONE-DIMENSIONAL KONDO-LATTICE MODEL, Physical review. B, Condensed matter, 54(17), 1996, pp. 12212-12215
We show a strong indication of the existence of a large Fermi surface
in the one-dimensional Kondo-lattice model. The characteristic wave ve
ctor of the model is found to be k(F)=(1 + rho)pi/2, rho being the den
sity of the conduction electrons. This result is at first obtained for
a variant of the model that includes an antiferromagnetic Heisenberg
interaction J(H) between the local moments. It is then directly observ
ed in the conventional Kondo lattice (J(H)=0), in the narrow range of
Kondo couplings where the long distance properties of the model are nu
merically accessible.