  Charge order is a commonly observed phenomenon in strongly correlated
materials. However, most theories are based on a repulsive inter-site Coulomb
interaction in order to explain charge order. We here show that only due to
local interactions, charge order is favorable in heavy fermion systems at
quarter filling. The driving force is the Kondo effect, which leads to a
non-linear dependence on the filling of the lattice site for the energy gain.
We use dynamical mean field theory combined with numerical renormalization
group to demonstrate the existence of charge order at quarter filling for a
Kondo lattice model.
