Formation of the magnetic state of a Kondo lattice
Irkhin V. Yu., Katsnel'son M. I.
The mutual influence of the Kondo effect and the intersite exchange interaction is analyzed by a simple version of the renormalization-group method for a periodic s-/exchange model. Any of several situations can arise—an ordinary magnetic state, a Kondo magnetic state, and a nonmagnetic Kondo lattice—depending on the relation between the one-impurity Kondo temperature and the seed frequency of the spin fluctuations. Explicit expressions are derived for the saturation moment and for the renormalization of the spin dynamics for the case of a "ferromagnetic" ^-/exchange.