kondo effect and kondo lattice

Kondo effect is one of the most significant feature of heave fermion material. It is basiclly , as I said in my presentation, the increasing of resistivity which caused by the interaction between the spin of conduction electron and the spin of impurity.At zero temperature, the spin of conduction electron will make asinglit with the spin of impurity .So, the resistivity p is propotional to log (Tf/T) and in real system the resistivity will be finite.
Kondo lattice appears when we have more impurities in the system and hence the intraction between impurites is taken into account as well as the intraction between conduction electron with impurity to calculate the resistivity.Actually, now kondo effect depend on the spin of impurities (ferromagnet or antiferromagnet)and the strength btween them.